ATcT [1, 2] enthalpies of formation based on version 1.112 of the Thermochemical Network [3]

Below is a list of 0 K and 298.15 K enthalpies of formation for all (959) species that were included in ver. 1.112.
This is the version of ATcT results that was used to update the Goos/Burcat/Ruscic [4] database of NASA polynomials.

Except for the elements in their standard states, which are listed first, the listing order follows the actual order from the ATcT solution file, reflecting the number of thermochemically-relevant determinations that include the species in question (highest first).
A good way to find the species that you are interested in is by using the 'Find' function of your browser.

Species Name	Formula	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
Hydrogen molecule	H2 (g)	0	0	exact		2.01588 ± 0.00014	1333-74-0*0
Oxygen molecule	O2 (g)	0	0	exact		31.99880 ± 0.00060	7782-44-7*0
Graphite	C (graphite)	0	0	exact		12.01070 ± 0.00080	7440-44-0*500
Nitrogen molecule	N2 (g)	0	0	exact		28.01348 ± 0.00014	7727-37-9*0
Fluorine molecule	F2 (g)	0	0	exact		37.9968064 ± 0.0000010	7782-41-4*0
Chlorine molecule	Cl2 (g)	0	0	exact		70.9054 ± 0.0018	7782-50-5*0
Bromine molecule	Br2 (cr,l)	0	0	exact		159.8080 ± 0.0020	7726-95-6*500
Iodine molecule	I2 (cr,l)	0	0	exact		253.808940 ± 0.000060	7553-56-2*500
Helium	He (g)	0	0	exact		4.0026020 ± 0.0000020	7440-59-7*0
Neon	Ne (g)	0	0	exact		20.17970 ± 0.00060	7440-01-9*0
Argon	Ar (g)	0	0	exact		39.9480 ± 0.0010	7440-37-1*0
Krypton	Kr (g)	0	0	exact		83.8000 ± 0.1000	7439-90-9*0
Xenon	Xe (g)	0	0	exact		131.2900 ± 0.0200	7440-63-3*0
Hydrogen atom	H (g)	216.034	217.998	± 0.000	kJ/mol	1.007940 ± 0.000070	12385-13-6*0
Carbon atom	C (g)	711.388	716.873	± 0.057	kJ/mol	12.01070 ± 0.00080	7440-44-0*0
Oxygen atom	O (g)	246.844	249.229	± 0.002	kJ/mol	15.99940 ± 0.00030	17778-80-2*0
Nitrogen atom	N (g)	470.573	472.435	± 0.024	kJ/mol	14.006740 ± 0.000070	17778-88-0*0
Carbon dioxide	CO2 (g)	-393.108	-393.474	± 0.015	kJ/mol	44.0095 ± 0.0010	124-38-9*0
Fluorine atom	F (g)	77.268	79.374	± 0.057	kJ/mol	18.99840320 ± 0.00000050	14762-94-8*0
Water	H2O (cr,l)	-286.297	-285.825	± 0.027	kJ/mol	18.01528 ± 0.00033	7732-18-5*500
Methane	CH4 (g)	-66.564	-74.534	± 0.057	kJ/mol	16.04246 ± 0.00085	74-82-8*0
Chlorine atom	Cl (g)	119.621	121.302	± 0.002	kJ/mol	35.45270 ± 0.00090	22537-15-1*0
Bromine atom	Br (g)	117.914	111.852	± 0.056	kJ/mol	79.9040 ± 0.0010	10097-32-2*0
Water	H2O (g)	-238.919	-241.822	± 0.027	kJ/mol	18.01528 ± 0.00033	7732-18-5*0
Hydrogen atom cation	H+ (g)	1528.084	1530.047	± 0.000	kJ/mol	1.007391 ± 0.000070	12408-02-5*0
Hydrogen chloride	HCl (g)	-91.989	-92.173	± 0.006	kJ/mol	36.46064 ± 0.00090	7647-01-0*0
Hydroxyl	OH (g)	37.262	37.501	± 0.027	kJ/mol	17.00734 ± 0.00031	3352-57-6*0
Hydrogen bromide	HBr (g)	-28.01	-35.85	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*0
Hydrogen fluoride	HF (g)	-272.664	-272.711	± 0.057	kJ/mol	20.006343 ± 0.000070	7664-39-3*0
Carbon monoxide	CO (g)	-113.805	-110.525	± 0.026	kJ/mol	28.01010 ± 0.00085	630-08-0*0
Iodine atom	I (g)	107.157	106.757	± 0.002	kJ/mol	126.904470 ± 0.000030	14362-44-8*0
Ethylene	C2H4 (g)	61.07	52.56	± 0.15	kJ/mol	28.0532 ± 0.0016	74-85-1*0
Methanol	CH3OH (g)	-189.82	-200.70	± 0.18	kJ/mol	32.04186 ± 0.00090	67-56-1*0
Ethane	C2H6 (g)	-68.12	-83.78	± 0.17	kJ/mol	30.0690 ± 0.0017	74-84-0*0
Formaldehyde	H2CO (g)	-105.33	-109.16	± 0.11	kJ/mol	30.02598 ± 0.00087	50-00-0*0
Acetylene	HCCH (g)	228.88	228.32	± 0.15	kJ/mol	26.0373 ± 0.0016	74-86-2*0
Methyl chloride	CH3Cl (g)	-74.68	-82.62	± 0.21	kJ/mol	50.4872 ± 0.0012	74-87-3*0
Ethanol	CH3CH2OH (g)	-216.85	-234.57	± 0.22	kJ/mol	46.0684 ± 0.0017	64-17-5*0
Methyl radical	CH3 (g)	149.880	146.494	± 0.081	kJ/mol	15.03452 ± 0.00083	2229-07-4*0
Ammonia	NH3 (g)	-38.565	-45.558	± 0.030	kJ/mol	17.03056 ± 0.00022	7664-41-7*0
Nitric oxide	NO (g)	90.585	91.089	± 0.064	kJ/mol	30.00614 ± 0.00031	10102-43-9*0
Methyl fluoride	CH3F (g)	-228.55	-236.58	± 0.32	kJ/mol	34.03292 ± 0.00083	593-53-3*0
Hydrogen iodide	HI (g)	28.645	26.470	± 0.036	kJ/mol	127.912410 ± 0.000076	10034-85-2*0
Methyl bromide	CH3Br (g)	-20.98	-36.38	± 0.19	kJ/mol	94.9385 ± 0.0013	74-83-9*0
Hydrogen cyanide	HCN (g)	129.675	129.291	± 0.095	kJ/mol	27.02538 ± 0.00081	74-90-8*0
Hydroxyde ion	[OH]- (g)	-139.080	-139.047	± 0.027	kJ/mol	17.00789 ± 0.00031	14280-30-9*0
Nitrogen dioxide	ONO (g)	36.824	34.017	± 0.064	kJ/mol	46.00554 ± 0.00060	10102-44-0*0
Tetrafluoromethane	CF4 (g)	-927.41	-933.38	± 0.27	kJ/mol	88.00431 ± 0.00080	75-73-0*0
Fluoride	F- (g)	-250.897	-249.112	± 0.057	kJ/mol	18.99895178 ± 0.00000050	16984-48-8*0
Hydrogen peroxide	H2O2 (g)	-129.452	-135.442	± 0.064	kJ/mol	34.01468 ± 0.00062	7722-84-1*0
Hydroperoxo	HO2 (g)	15.19	12.27	± 0.17	kJ/mol	33.00674 ± 0.00060	3170-83-0*0
Dibromine	Br2 (g)	45.68	30.88	± 0.12	kJ/mol	159.8080 ± 0.0020	7726-95-6*0
Acetaldehyde	CH3CHO (g)	-154.90	-165.37	± 0.32	kJ/mol	44.0526 ± 0.0017	75-07-0*0
Fluoroform	CF3H (g)	-688.90	-695.85	± 0.56	kJ/mol	70.01385 ± 0.00080	75-46-7*0
Hypoflorous acid	HOF (g)	-84.36	-87.26	± 0.19	kJ/mol	36.00574 ± 0.00031	14034-79-8*0
Hypochlorous acid	HOCl (g)	-73.865	-76.805	± 0.028	kJ/mol	52.46004 ± 0.00095	7790-92-3*0
Hypobromous acid	HOBr (g)	-51.31	-61.78	± 0.55	kJ/mol	96.9113 ± 0.0010	13517-11-8*0
Diiodine	I2 (g)	65.497	62.417	± 0.004	kJ/mol	253.808940 ± 0.000060	7553-56-2*0
Methyl iodide	CH3I (g)	24.49	14.96	± 0.17	kJ/mol	141.93899 ± 0.00083	74-88-4*0
Tetrachloromethane	CCl4 (g)	-95.42	-97.59	± 0.75	kJ/mol	153.8215 ± 0.0037	56-23-5*0
Benzene	C6H6 (g)	100.70	83.18	± 0.26	kJ/mol	78.1118 ± 0.0048	71-43-2*0
Trifluoromethyl	CF3 (g)	-465.40	-468.19	± 0.59	kJ/mol	69.00591 ± 0.00080	2264-21-3*0
Ethyl	CH3CH2 (g)	131.00	119.93	± 0.37	kJ/mol	29.0611 ± 0.0016	2025-56-1*0
Bromide	Br- (g)	-206.623	-212.685	± 0.056	kJ/mol	79.9045 ± 0.0010	24959-67-9*0
Iodide	I- (g)	-187.995	-188.396	± 0.002	kJ/mol	126.905019 ± 0.000030	20461-54-5*0
Difluorophosgene	COF2 (g)	-603.56	-606.65	± 0.54	kJ/mol	66.00691 ± 0.00085	353-50-4*0
Cyanogen chloride	ClCN (g)	135.01	135.74	± 0.45	kJ/mol	61.4701 ± 0.0012	506-77-4*0
Tetrabromomethane	CBr4 (g)	131.7	102.0	± 1.1	kJ/mol	331.6267 ± 0.0041	558-13-4*0
Phenyl	C6H5 (g)	350.57	337.29	± 0.59	kJ/mol	77.1039 ± 0.0048	2396-01-2*0
Hydroxymethyl	CH2OH (g)	-9.79	-16.10	± 0.44	kJ/mol	31.03392 ± 0.00088	2597-43-5*0
Methylcarbonium	[CH3]+ (g)	1099.286	1095.517	± 0.078	kJ/mol	15.03397 ± 0.00083	14531-53-4*0
Methoxide	[CH3O]- (g)	-122.25	-130.24	± 0.37	kJ/mol	31.03447 ± 0.00088	3315-60-4*0
Formic acid	HC(O)OH (g, syn)	-371.19	-378.51	± 0.25	kJ/mol	46.0254 ± 0.0010	64-18-6*1
Nitric acid	HNO3 (g)	-124.45	-134.16	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*0
Imidogen	NH (g)	358.74	358.79	± 0.17	kJ/mol	15.014680 ± 0.000099	13774-92-0*0
Oxomethylium	[HCO]+ (g)	827.83	827.24	± 0.11	kJ/mol	29.01749 ± 0.00086	17030-74-9*0
Methylidyne radical	CH (g)	592.83	596.17	± 0.13	kJ/mol	13.01864 ± 0.00080	3315-37-5*0
Ozone	OOO (g)	144.398	141.749	± 0.040	kJ/mol	47.99820 ± 0.00090	10028-15-6*0
Oxonium	[H3O]+ (g)	605.74	598.75	± 0.61	kJ/mol	19.02267 ± 0.00037	13968-08-6*0
Allene	CH2CCH2 (g)	197.65	190.16	± 0.36	kJ/mol	40.0639 ± 0.0024	463-49-0*0
Methylene radical	CH2 (g, singlet)	428.62	429.04	± 0.15	kJ/mol	14.02658 ± 0.00081	2465-56-7*2
Ketene	CH2CO (g)	-45.46	-48.57	± 0.15	kJ/mol	42.0367 ± 0.0016	463-51-4*0
Methylene fluoride	CH2F2 (g)	-443.46	-451.04	± 0.46	kJ/mol	52.02339 ± 0.00081	75-10-5*0
Chloride	Cl- (g)	-228.953	-227.346	± 0.003	kJ/mol	35.45325 ± 0.00090	16887-00-6*0
Methylene radical	CH2 (g, triplet)	390.95	391.46	± 0.14	kJ/mol	14.02658 ± 0.00081	2465-56-7*1
Cyanogen fluoride	FCN (g)	8.13	8.46	± 0.74	kJ/mol	45.01584 ± 0.00080	1495-50-7*0
Methoxy radical	CH3O (g)	29.22	21.85	± 0.36	kJ/mol	31.03392 ± 0.00088	2143-68-2*0
Formyl	HCO (g)	41.45	41.83	± 0.11	kJ/mol	29.01804 ± 0.00086	2597-44-6*0
Propyne	CH3CCH (g)	192.89	185.83	± 0.37	kJ/mol	40.0639 ± 0.0024	74-99-7*0
Hypochlorite	[ClO]- (g)	-118.61	-118.34	± 0.13	kJ/mol	51.45265 ± 0.00095	14380-61-1*0
Cyano radical	CN (g)	436.68	439.97	± 0.15	kJ/mol	26.01744 ± 0.00080	2074-87-5*0
Cyanogen bromide	BrCN (g)	187.55	180.75	± 0.78	kJ/mol	105.9214 ± 0.0013	506-68-3*0
1-Hydroxyethyl	CH3CHOH (g, gauche-anti)	-41.86	-55.29	± 0.62	kJ/mol	45.0605 ± 0.0017	2348-46-1*1
2-Hydroxyethyl	CH2CH2OH (g, gauche-syn)	-12.55	-25.82	± 0.61	kJ/mol	45.0605 ± 0.0017	4422-54-2*1
Oxygen atom anion	O- (g)	105.868	108.097	± 0.002	kJ/mol	15.99995 ± 0.00030	14337-01-0*0
Ethyl chloride	CH3CH2Cl (g)	-96.65	-111.24	± 0.22	kJ/mol	64.5138 ± 0.0019	75-00-3*0
Oxygen difluoride	FOF (g)	26.93	24.67	± 0.25	kJ/mol	53.99621 ± 0.00030	7783-41-7*0
Nitrite	[ONO]- (g)	-182.67	-185.48	± 0.46	kJ/mol	46.00609 ± 0.00060	14797-65-0*0
Nitrosyl hydride	HNO (g)	109.89	106.92	± 0.11	kJ/mol	31.01408 ± 0.00032	14332-28-6*0
Vinyl	C2H3 (g)	301.35	297.27	± 0.47	kJ/mol	27.0452 ± 0.0016	2669-89-8*0
Ethoxide	[CH3CH2O]- (g)	-163.23	-178.17	± 0.51	kJ/mol	45.0610 ± 0.0017	16331-64-9*0
Phenylium	[C6H5]+ (g)	1148.74	1136.84	± 0.95	kJ/mol	77.1034 ± 0.0048	17333-73-2*0
Methylenimine	H2CNH (g)	96.61	88.70	± 0.98	kJ/mol	29.04126 ± 0.00083	2053-29-4*0
Hydride	H- (g)	143.264	145.228	± 0.000	kJ/mol	1.008489 ± 0.000070	12184-88-2*0
Hypoiodous acid	HOI (g)	-56.5	-61.3	± 2.0	kJ/mol	143.91181 ± 0.00031	14332-21-9*0
Amidogen	NH2 (g)	188.94	186.05	± 0.15	kJ/mol	16.02262 ± 0.00016	13770-40-6*0
Hydroxylamine	NH2OH (g, trans)	-33.12	-43.50	± 0.49	kJ/mol	33.02996 ± 0.00037	7803-49-8*1
Oxirane	O(CH2CH2) (g)	-40.14	-52.68	± 0.44	kJ/mol	44.0526 ± 0.0017	75-21-8*0
Tetraiodomethane	CI4 (g)	341.2	336.1	± 1.4	kJ/mol	519.62858 ± 0.00081	507-25-5*0
Chlorotrifluoromethane	CF3Cl (g)	-705.20	-710.30	± 0.75	kJ/mol	104.4586 ± 0.0012	75-72-9*0
Bromotrifluoromethane	CF3Br (g)	-640.05	-652.17	± 0.60	kJ/mol	148.9099 ± 0.0013	75-63-8*0
Chloroxyl radical	ClO (g)	101.116	101.707	± 0.035	kJ/mol	51.45210 ± 0.00095	14989-30-1*0
Fluoromethylidyne	CF (g)	243.16	246.76	± 0.15	kJ/mol	31.00910 ± 0.00080	3889-75-6*0
Tetrafluoroethylene	C2F4 (g)	-671.85	-675.28	± 0.73	kJ/mol	100.0150 ± 0.0016	116-14-3*0
Fluoroxyl radical	FO (g)	110.29	110.91	± 0.15	kJ/mol	34.99780 ± 0.00030	12061-70-0*0
Methylamine	CH3NH2 (g)	-5.83	-20.91	± 0.53	kJ/mol	31.05714 ± 0.00088	74-89-5*0
Ethynyl	C2H (g)	563.79	567.91	± 0.17	kJ/mol	25.0293 ± 0.0016	2122-48-7*0
Propane	CH3CH2CH3 (g)	-82.11	-104.39	± 0.29	kJ/mol	44.0956 ± 0.0025	74-98-6*0
Ethoxy	CH3CH2O (g, X 2A")	1.95	-11.95	± 0.50	kJ/mol	45.0605 ± 0.0017	2154-50-9*51
Isocyanic acid	HNCO (g)	-116.06	-119.05	± 0.37	kJ/mol	43.02478 ± 0.00086	75-13-8*0
Cyanato	NCO (g)	126.89	127.36	± 0.39	kJ/mol	42.01684 ± 0.00086	22400-26-6*0
Chloroform	CCl3H (g)	-98.61	-103.51	± 0.66	kJ/mol	119.3767 ± 0.0028	67-66-3*0
Methylene chloride	CH2Cl2 (g)	-87.82	-94.68	± 0.60	kJ/mol	84.9320 ± 0.0020	75-09-2*0
Vinyl chloride	CH2CHCl (g)	29.57	22.10	± 0.35	kJ/mol	62.4979 ± 0.0018	75-01-4*0
Acetone	CH3C(O)CH3 (g)	-199.38	-216.07	± 0.37	kJ/mol	58.0791 ± 0.0025	67-64-1*0
Hydrogen fluoride	HF (aq)		-334.53	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*800
Hypobromite	[BrO]- (g)	-96.22	-103.70	± 0.55	kJ/mol	95.9039 ± 0.0010	14380-62-2*0
Trihydrogen cation	[H3]+ (g)	1110.304	1106.696	± 0.013	kJ/mol	3.02327 ± 0.00021	28132-48-1*0
Diazenylium	[N2H]+ (g)	1042.76	1039.14	± 0.74	kJ/mol	29.02087 ± 0.00016	12357-66-3*0
Methyl hydroperoxide	CH3OOH (g)	-114.98	-127.81	± 0.91	kJ/mol	48.0413 ± 0.0010	3031-73-0*0
Hydroxyformyl	HOCO (g, trans)	-181.39	-184.36	± 0.55	kJ/mol	45.0174 ± 0.0010	2564-86-5*1
Ethyl bromide	CH3CH2Br (g)	-41.19	-63.13	± 0.28	kJ/mol	108.9651 ± 0.0019	74-96-4*0
Vinyl fluoride	CH2CHF (g)	-134.7	-142.5	± 1.1	kJ/mol	46.0436 ± 0.0016	75-02-5*0
Vinyl bromide	CH2CHBr (g)	88.48	73.68	± 0.62	kJ/mol	106.9492 ± 0.0019	593-60-2*0
2-Bromoethanol	BrCH2CH2OH (g)	-196.69	-220.75	± 0.54	kJ/mol	124.9645 ± 0.0019	540-51-2*0
Fluorobenzene	C6H5F (g)	-99.72	-115.40	± 1.02	kJ/mol	96.1023 ± 0.0048	462-06-6*0
Nitrous oxide	NNO (g)	86.003	82.574	± 0.097	kJ/mol	44.01288 ± 0.00033	10024-97-2*0
(E)-Diazene	HNNH (g, trans)	207.36	200.22	± 0.56	kJ/mol	30.02936 ± 0.00020	15626-43-4*0
Hydroxyoxomethylium	[HOCO]+ (g)	600.83	597.97	± 0.49	kJ/mol	45.0169 ± 0.0010	638-71-1*0
Vinylium	[C2H3]+ (g)	1118.86	1115.84	± 0.61	kJ/mol	27.0447 ± 0.0016	14604-48-9*0
Hydroxymethylium	[CH2OH]+ (g)	718.00	710.06	± 0.24	kJ/mol	31.03337 ± 0.00088	18682-95-6*0
Cyanogen	NCCN (g)	308.16	310.10	± 0.43	kJ/mol	52.0349 ± 0.0016	460-19-5*0
Cyanogen iodide	ICN (g)	222.61	222.10	± 1.00	kJ/mol	152.92191 ± 0.00080	506-78-5*0
Peroxide ion	[HO2]- (g)	-88.83	-91.54	± 0.39	kJ/mol	33.00729 ± 0.00060	14691-59-9*0
2-Chloroethanol	ClCH2CH2OH (g)	-250.05	-266.76	± 0.61	kJ/mol	80.5132 ± 0.0019	107-07-3*0
Hydrogen chloride	HCl (aq, 600 H2O)		-166.454	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*834
Methonium	[CH5]+ (g)	921.69	911.03	± 0.49	kJ/mol	17.04985 ± 0.00087	15135-49-6*0
Hydroxyamidogen	HNOH (g, trans)	101.54	94.70	± 1.00	kJ/mol	32.02202 ± 0.00034	13940-32-4*1
Nitrate	[NO3]- (g)	-300.11	-306.58	± 0.61	kJ/mol	62.00549 ± 0.00090	14797-55-8*0
Hypofluorite	[FO]- (g)	-108.95	-108.78	± 0.48	kJ/mol	34.99835 ± 0.00030	12763-66-5*0
Dioxygenyl fluoride	FOO (g)	26.83	25.12	± 0.26	kJ/mol	50.99720 ± 0.00060	15499-23-7*0
Propylene	CH3CHCH2 (g)	35.37	20.37	± 0.33	kJ/mol	42.0797 ± 0.0024	115-07-1*0
Acetyl	CH3CO (g)	-3.02	-9.68	± 0.40	kJ/mol	43.0446 ± 0.0016	3170-69-2*0
Bromoform	CBr3H (g)	73.5	47.4	± 1.3	kJ/mol	252.7306 ± 0.0031	75-25-2*0
2-Fluoroethanol	FCH2CH2OH (g)	-407.1	-424.3	± 1.1	kJ/mol	64.0589 ± 0.0017	371-62-0*0
Phenide	[C6H5]- (g)	244.90	231.99	± 0.44	kJ/mol	77.1044 ± 0.0048	30922-78-2*0
Bromobenzene	C6H5Br (g)	127.0	104.9	± 1.3	kJ/mol	157.0079 ± 0.0049	108-86-1*0
Bromoxyl radical	BrO (g)	131.15	123.61	± 0.30	kJ/mol	95.9034 ± 0.0010	15656-19-6*0
Iodine monochloride	ICl (g)	19.024	17.391	± 0.013	kJ/mol	162.35717 ± 0.00090	7790-99-0*0
Iodotrifluoromethane	CF3I (g)	-584.62	-590.50	± 0.63	kJ/mol	195.91038 ± 0.00080	2314-97-8
Nitroxyl	H2NO (g)	71.34	64.73	± 0.85	kJ/mol	32.02202 ± 0.00034	13408-29-2*0
Hydrogen bromide	HBr (aq)		-120.99	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*800
Peroxynitrous acid	HOONO (g, cis,cis)	-6.13	-14.57	± 0.38	kJ/mol	63.01288 ± 0.00091	14691-52-2*3
Ethylium	[CH3CH2]+ (g)	915.14	902.90	± 0.39	kJ/mol	29.0606 ± 0.0016	14936-94-8*0
Hydroxymethylene	HCOH (g, trans)	111.96	108.19	± 0.43	kJ/mol	30.02598 ± 0.00087	19710-56-6*1
Formyl anion	[HCO]- (g)	11.61	12.04	± 0.44	kJ/mol	29.01859 ± 0.00086	57340-31-5*0
2-Propynyl	CH2CCH (g)	354.07	351.51	± 0.48	kJ/mol	39.0559 ± 0.0024	2932-78-7*0
1-Hydroxyethylium	[CH3CHOH]+ (g, anti)	609.24	594.82	± 0.40	kJ/mol	45.0600 ± 0.0017	18682-96-7*1
Ethoxy	CH3CH2O (g, A 2A')	6.20	-8.23	± 0.50	kJ/mol	45.0605 ± 0.0017	2154-50-9*52
Methylperoxy	CH3OO (g)	21.81	12.06	± 0.90	kJ/mol	47.0333 ± 0.0010	2143-58-0*0
Formic acid	HC(O)OH (g, anti)	-354.86	-362.10	± 0.41	kJ/mol	46.0254 ± 0.0010	64-18-6*2
Formyloxy	HC(O)O (g, 2A1 only)	-123.60	-125.28	± 0.61	kJ/mol	45.0174 ± 0.0010	16499-21-1*1
Formate	[HC(O)O]- (g)	-462.21	-465.85	± 0.77	kJ/mol	45.0180 ± 0.0010	71-47-6*0
Phosgene	COCl2 (g)	-217.34	-219.03	± 0.28	kJ/mol	98.9155 ± 0.0020	75-44-5*0
Chlorodifluoromethane	CHClF2 (g)	-476.7	-482.8	± 1.2	kJ/mol	86.4681 ± 0.0012	75-45-6*0
Fluoromethylene	CHF (g, singlet)	148.33	148.61	± 0.46	kJ/mol	32.01704 ± 0.00080	13453-52-6*2
Ethyl fluoride	CH3CH2F (g)	-257.67	-272.54	± 0.96	kJ/mol	48.0595 ± 0.0016	353-36-6*0
Chlorobenzene	C6H5Cl (g)	67.18	52.22	± 0.61	kJ/mol	112.5566 ± 0.0049	108-90-7*0
Ethynide	[C2H]- (g)	277.40	280.90	± 0.41	kJ/mol	25.0299 ± 0.0016	29075-95-4*0
Amide	[NH2]- (g)	114.98	112.11	± 0.34	kJ/mol	16.02317 ± 0.00016	17655-31-1*0
Hydrazine	H2NNH2 (g)	109.66	95.51	± 0.19	kJ/mol	32.04524 ± 0.00031	302-01-2*0
Ethylidyne	CH3C (g)	512.7	508.6	± 1.4	kJ/mol	27.0452 ± 0.0016	67624-57-1*0
Dihydrogen trioxide	HOOOH (g, trans)	-82.13	-90.87	± 0.91	kJ/mol	50.01408 ± 0.00091	14699-99-1*1
Hydrogen trioxide anion	[HOOO]- (g, cis)	-121.7	-125.3	± 1.7	kJ/mol	49.00669 ± 0.00090	89965-38-8*2
1-Hydroxyethyl	CH3CHOH (g, gauche-syn)	-40.33	-53.80	± 0.87	kJ/mol	45.0605 ± 0.0017	2348-46-1*2
Protonated oxirane	[(CH2CH2)OH]+ (g)	725.17	709.00	± 0.64	kJ/mol	45.0600 ± 0.0017	38607-31-70
Oxoethenyl	HCCO (g)	176.85	177.97	± 0.60	kJ/mol	41.0287 ± 0.0016	51095-15-9*0
Methanediol	CH2(OH)2 (g, conrot gauche)	-379.20	-393.40	± 0.96	kJ/mol	48.0413 ± 0.0010	463-57-0*1
Acetyl chloride	CH3C(O)Cl (g)	-232.59	-241.46	± 0.34	kJ/mol	78.4973 ± 0.0019	75-36-5*0
Methylene bromide	CH2Br2 (g)	24.5	3.1	± 1.2	kJ/mol	173.8346 ± 0.0022	74-95-3*0
Difluorodichloromethane	CF2Cl2 (g)	-491.05	-495.81	± 0.98	kJ/mol	120.9129 ± 0.0020	75-71-8*0
Fluorodichloromethane	CHFCl2 (g)	-279.1	-284.5	± 1.3	kJ/mol	102.9224 ± 0.0020	75-43-4*0
Hydrogen chloride	HCl (aq)		-166.993	± 0.023	kJ/mol	36.46064 ± 0.00090	7647-01-0*800
Iodoxyl radical	IO (g)	127.0	125.0	± 1.1	kJ/mol	142.90387 ± 0.00030	14696-98-1*0
Nitrogen sesquioxide	ONNO2 (g)	90.65	86.08	± 0.15	kJ/mol	76.01168 ± 0.00091	10544-73-7*0
Ammonium	[NH4]+ (g)	643.02	631.71	± 0.21	kJ/mol	18.03795 ± 0.00029	14798-03-9*0
Ammonium	[NH4]+ (aq)		-133.081	± 0.056	kJ/mol	18.03795 ± 0.00029	14798-03-9*800
Hydrazyl	N2H3 (g)	235.51	224.86	± 0.93	kJ/mol	31.03730 ± 0.00025	13598-46-4*0
Hydrazoic acid	HNNN (g)	298.13	291.83	± 0.58	kJ/mol	43.02816 ± 0.00022	7782-79-8*0
Dioxygen cation	[O2]+ (g)	1164.585	1165.221	± 0.010	kJ/mol	31.99825 ± 0.00060	12185-07-8*0
1,2-Propadiene-1,3-diylidene	CCC (g)	814.7	823.6	± 1.1	kJ/mol	36.0321 ± 0.0024	12075-35-3*0
Ethylidene	CH3CH (g, triplet)	361.5	354.5	± 1.2	kJ/mol	28.0532 ± 0.0016	4218-50-2*1
Acetylium	[CH3CO]+ (g)	666.77	659.60	± 0.74	kJ/mol	43.0441 ± 0.0016	15762-07-9*0
Hydrogen isocyanide cation	[HNC]+ (g)	1352.9	1352.9	± 1.4	kJ/mol	27.02483 ± 0.00081	74158-11-5*0
Dihydrogen trioxide	HOOOH (g, cis)	-72.51	-81.60	± 1.00	kJ/mol	50.01408 ± 0.00091	14699-99-1*2
2-Hydroxyethyl	CH2CH2OH (g, gauche-anti)	-9.73	-22.36	± 0.86	kJ/mol	45.0605 ± 0.0017	4422-54-2*2
Methanediol	CH2(OH)2 (g, disrot gauche)	-368.67	-381.82	± 1.00	kJ/mol	48.0413 ± 0.0010	463-57-0*2
Chloronium	[HClH]+ (g)	881.5	878.4	± 1.2	kJ/mol	37.46803 ± 0.00091	36658-55-6*0
Trifluoromethylium	[CF3]+ (g)	408.80	405.73	± 0.66	kJ/mol	69.00536 ± 0.00080	18851-76-8*0
Fluoroformyl	FCO (g)	-176.89	-176.31	± 0.51	kJ/mol	47.00850 ± 0.00085	1871-24-5*0
Fluoronium	[HFH]+ (g)	775.1	772.2	± 1.2	kJ/mol	21.01373 ± 0.00014	12206-67-6*0
Dioxygen difluoride	FOOF (g)	37.33	33.61	± 0.38	kJ/mol	69.99561 ± 0.00060	7783-44-0*0
Bromonium	[HBrH]+ (g)	925.2	914.5	± 1.7	kJ/mol	81.9193 ± 0.0010	36658-54-5*0
Oxonitrate anion	[NO]- (g)	87.88	87.91	± 0.12	kJ/mol	30.00669 ± 0.00031	14967-78-3*0
Nitric acid	HNO3 (aq)		-206.60	± 0.19	kJ/mol	63.01288 ± 0.00091	7697-37-2*800
Oxoammoniumyl	[HNO]+ (g)	1092.48	1089.56	± 0.70	kJ/mol	31.01353 ± 0.00032	63559-87-5*0
Nitrous acid	HONO (g, trans)	-73.044	-79.188	± 0.079	kJ/mol	47.01348 ± 0.00061	7782-77-6*1
Peroxynitrous acid	HOONO (g, trans,perp)	7.57	0.49	± 0.42	kJ/mol	63.01288 ± 0.00091	14691-52-2*1
Ethynylene	C2 (g)	820.31	828.37	± 0.30	kJ/mol	24.0214 ± 0.0016	12070-15-4*0
Ozonide ion	[OOO]- (g)	-58.50	-60.85	± 0.21	kJ/mol	47.99875 ± 0.00090	12596-80-4*0
Hydrogen peroxide cation	[H2O2]+ (g, trans)	896.75	889.79	± 0.60	kJ/mol	34.01413 ± 0.00062	12325-10-9*1
Ethylidene	CH3CH (g, singlet)	374.6	366.9	± 1.2	kJ/mol	28.0532 ± 0.0016	4218-50-2*2
Iminomethyl cation	[HCNH]+ (g)	953.4	949.4	± 1.6	kJ/mol	28.03277 ± 0.00082	196216-36-1*0
Dichloride	[Cl2]- (g)	-230.7	-229.7	± 1.8	kJ/mol	70.9059 ± 0.0018	12595-89-0*0
2-Hydroxyethyl	CH2CH2OH (g, staggered-anti)	-4.7	-17.2	± 1.2	kJ/mol	45.0605 ± 0.0017	4422-54-2*3
Ketene	CH2CO (g, triplet)	182.6	179.5	± 1.3	kJ/mol	42.0367 ± 0.0016	463-51-4*1
Dicarbon monoxide	CCO (g, triplet)	374.8	378.9	± 1.3	kJ/mol	40.0208 ± 0.0016	12071-23-7*1
Dimethyl ether	CH3OCH3 (g)	-166.51	-184.02	± 0.44	kJ/mol	46.0684 ± 0.0017	115-10-6*0
Formic acid	HC(O)OH (g, syn-anti equilib)	-371.19	-378.49	± 0.25	kJ/mol	46.0254 ± 0.0010	64-18-6*0
Hydroxyformyl	HOCO (g, cis)	-173.95	-177.06	± 0.62	kJ/mol	45.0174 ± 0.0010	2564-86-5*2
Hydrogen fluoride	HF (aq, 20 H2O)		-321.07	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*818
Fluorotrichloromethane	CCl3F (g)	-287.5	-290.7	± 1.2	kJ/mol	137.3672 ± 0.0028	75-69-4*0
Bromotrichloromethane	CCl3Br (g)	-33.88	-43.03	± 0.74	kJ/mol	198.2728 ± 0.0030	75-62-7*0
Chlorine fluoride	ClF (g)	-55.608	-55.703	± 0.062	kJ/mol	54.45110 ± 0.00090	7790-89-8*0
Difluoromethylene	CF2 (g)	-193.87	-193.40	± 0.43	kJ/mol	50.00751 ± 0.00080	2154-59-8*0
Fluoromethylene	CHF (g, triplet)	210.17	210.51	± 0.69	kJ/mol	32.01704 ± 0.00080	13453-52-6*1
Oxygen atom cation	O+ (g)	1560.786	1562.644	± 0.002	kJ/mol	15.99885 ± 0.00030	14581-93-2*0
Tricarbon dioxide	OCCCO (g)	-97.7	-95.6	± 1.4	kJ/mol	68.0309 ± 0.0025	504-64-3*0
Hydrogen trioxide	OO(H)O (g)	300.2	294.3	± 1.4	kJ/mol	49.00614 ± 0.00090	12500-78-60
Iodobenzene	C6H5I (g)	177.9	161.9	± 1.1	kJ/mol	204.0084 ± 0.0048	591-50-4*0
Iodine monobromide	IBr (g)	49.716	40.769	± 0.066	kJ/mol	206.8085 ± 0.0010	7789-33-5*0
Difluoride	[F2]- (g)	-292.3	-291.5	± 1.6	kJ/mol	37.9973550 ± 0.0000010	12184-85-9*0
Water anion	[(H)(OH)]- (g, vdW)	30.7	29.0	± 2.8	kJ/mol	18.01583 ± 0.00033	12259-30-2*100
Isodiazene	H2NN (g)	308.00	300.94	± 0.81	kJ/mol	30.02936 ± 0.00020	28647-38-3*0
Methyl carbanion	[CH3]- (g)	147.5	144.4	± 1.2	kJ/mol	15.03507 ± 0.00083	15194-58-8*0
Methyliumyl	[CH2]+ (g)	1393.09	1393.62	± 0.14	kJ/mol	14.02603 ± 0.00081	15091-72-2*0
Bromine monochloride	BrCl (g)	21.878	14.434	± 0.059	kJ/mol	115.3567 ± 0.0013	13863-41-7*0
(E)-Iminomethyl	HCNH (g, trans)	276.2	272.6	± 1.4	kJ/mol	28.03332 ± 0.00082	54980-10-8*0
Fluoroacetylene	HCCF (g)	103.71	104.42	± 0.95	kJ/mol	44.0277 ± 0.0016	2713-09-9*0
Chloroacetylene	HCCCl (g)	228.1	229.0	± 1.1	kJ/mol	60.4820 ± 0.0018	593-63-5*0
1,2-Propadienyl anion	[CH2CCH]- (g)	265.40	262.19	± 0.76	kJ/mol	39.0565 ± 0.0024	64066-06-4*0
1-Propynyl anion	[CH3CC]- (g)	261.25	257.78	± 0.73	kJ/mol	39.0565 ± 0.0024	36147-87-2*0
2-Hydroxyethylium	[CH2CH2OH]+ (g, staggered-anti)	1019.7	1006.9	± 1.7	kJ/mol	45.0600 ± 0.0017	38607-31-7*3
Vinyl alcohol	CH2CHOH (g, syn)	-112.40	-123.71	± 0.91	kJ/mol	44.0526 ± 0.0017	557-75-5*1
Dicarbon monoxide	CCO (g, singlet)	453.5	457.9	± 1.3	kJ/mol	40.0208 ± 0.0016	12071-23-7*2
Hydroxyformyl anion	[HOCO]- (g, cis)	-320.4	-323.1	± 1.2	kJ/mol	45.0180 ± 0.0010	78944-70-4*2
Acetic acid	CH3C(O)OH (g, syn)	-418.75	-432.87	± 0.64	kJ/mol	60.0520 ± 0.0017	64-19-7*1
Ethylene glycol	(CH2OH)2 (g)	-369.79	-389.42	± 0.49	kJ/mol	62.0678 ± 0.0018	107-21-1*0
Fluorochloromethane	CH2FCl (g)	-256.6	-263.7	± 1.3	kJ/mol	68.4777 ± 0.0012	593-70-4*0
Formyl fluoride	HFCO (g)	-378.94	-382.53	± 0.49	kJ/mol	48.01644 ± 0.00086	1493-02-3*0
1,3-Butadiyne	HCCCCH (g)	458.64	460.37	± 0.87	kJ/mol	50.0587 ± 0.0032	460-12-8*0
Hydroperoxonium	[H2OOH]+ (g)	738.7	728.4	± 1.3	kJ/mol	35.02207 ± 0.00064	70850-26-9*0
Fluorobenzene cation	[C6H5F]+ (g)	788.26	773.56	± 1.02	kJ/mol	96.1018 ± 0.0048	34468-25-2*0
Nitrosyl nitrite	ONONO (g, sym)	91.2	86.1	± 1.6	kJ/mol	76.01168 ± 0.00091	122413-35-8*1
Dinitrogen pentoxide	O2NONO2 (g)	24.33	14.76	± 0.35	kJ/mol	108.0105 ± 0.0015	10102-03-1*0
Hydrogen trioxide cation	[OO(H)O]+ (g)	1297.4	1290.8	± 1.7	kJ/mol	49.00559 ± 0.00090	74241-49-90
Hydrogen difluoride cation	[FFH]+ (g)	1175.5	1172.6	± 2.0	kJ/mol	39.004198 ± 0.000070	126950-54-70
Iodide	I- (aq)		-56.824	± 0.090	kJ/mol	126.905019 ± 0.000030	20461-54-5*800
Fluoride	F- (aq)		-334.53	± 0.17	kJ/mol	18.99895178 ± 0.00000050	16984-48-8*800
Carbon atom cation	C+ (g)	1797.841	1803.439	± 0.057	kJ/mol	12.01015 ± 0.00080	14067-05-1*0
n-Butane	CH3(CH2)2CH3 (g)	-98.54	-125.85	± 0.38	kJ/mol	58.1222 ± 0.0033	106-97-8
Vinyl anion	[C2H3]- (g)	237.61	233.21	± 0.86	kJ/mol	27.0458 ± 0.0016	25012-81-1*0
Acetylene cation	[HCCH]+ (g)	1328.65	1327.72	± 0.20	kJ/mol	26.0367 ± 0.0016	25641-79-6*0
Vinylidene	CCH2 (g)	411.36	412.27	± 0.63	kJ/mol	26.0373 ± 0.0016	2143-69-3*0
Vinylidene anion	[CCH2]- (g)	364.33	364.14	± 0.82	kJ/mol	26.0378 ± 0.0016	66295-36-1*0
Hydroperoxo cation	[HO2]+ (g)	1110.90	1107.99	± 0.11	kJ/mol	33.00619 ± 0.00060	12207-52-2*0
Methylamidogen anion	[CH3NH]- (g)	146.15	134.80	± 0.79	kJ/mol	30.04975 ± 0.00085	54448-39-4*0
Methyleneamidogen	H2CN (g)	242.23	238.57	± 0.95	kJ/mol	28.03332 ± 0.00082	15845-29-1*0
(Z)-Iminomethyl	HCNH (g, cis)	294.6	291.1	± 1.4	kJ/mol	28.03332 ± 0.00082	54980-11-9*0
Methyloxoniumylidene	[CH3O]+ (g)	1062.60	1054.98	± 0.71	kJ/mol	31.03337 ± 0.00088	58157-09-8*0
Hydroxymethylene	HCOH (g, cis)	130.40	126.66	± 0.43	kJ/mol	30.02598 ± 0.00087	19710-56-6*2
Hydroxymethylene cation	[HCOH]+ (g, trans)	972.2	968.5	± 1.6	kJ/mol	30.02543 ± 0.00087	135395-06-1*1
Bromonium	Br+ (g)	1257.775	1251.712	± 0.056	kJ/mol	79.9035 ± 0.0010	22541-56-6*0
Cyclopropene	CH2(CHCH) (g)	292.66	283.93	± 0.58	kJ/mol	40.0639 ± 0.0024	2781-85-3*0
1-Propynyl	CH3CC (g)	530.32	528.35	± 1.01	kJ/mol	39.0559 ± 0.0024	89342-91-6*0
1-Hydroxyethylium	[CH3CHOH]+ (g, syn)	611.2	596.7	± 1.2	kJ/mol	45.0600 ± 0.0017	18682-96-7*2
Vinyl alcohol	CH2CHOH (g, anti)	-107.93	-118.46	± 0.93	kJ/mol	44.0526 ± 0.0017	557-75-5*2
Vinyl alcohol cation	[CH2CHOH]+ (g, anti)	779.3	768.1	± 1.3	kJ/mol	44.0520 ± 0.0017	57239-63-1*2
Oxoniumylidene ion	[OH]+ (g)	1293.201	1293.231	± 0.036	kJ/mol	17.00679 ± 0.00031	12259-29-9*0
C=O=C	COC (g, triplet)	652.6	656.9	± 2.3	kJ/mol	40.0208 ± 0.0016	12071-23-71
C=O=C	COC (g, singlet)	720.8	725.2	± 1.7	kJ/mol	40.0208 ± 0.0016	12071-23-72
Oxirene	O(CHCH) (g, t-triplet)	389.9	385.7	± 2.8	kJ/mol	42.0367 ± 0.0016	157-18-6*11
Ethynol	HCCOH (g)	94.8	92.7	± 1.4	kJ/mol	42.0367 ± 0.0016	32038-79-2*0
Formic acid cation	[HC(O)OH]+ (g, syn)	721.79	714.63	± 0.28	kJ/mol	46.0248 ± 0.0010	50614-05-6*1
Dioxirane	H2C(OO) (g)	9.3	1.6	± 1.2	kJ/mol	46.0254 ± 0.0010	157-26-6*0
Hydroxyformyl anion	[HOCO]- (g, trans)	-314.5	-316.5	± 1.2	kJ/mol	45.0180 ± 0.0010	78944-70-4*1
Formyloxy	HC(O)O (g, 2B2 only)	-116.40	-119.73	± 0.77	kJ/mol	45.0174 ± 0.0010	16499-21-1*2
Isofulminic acid	HCNO (g)	170.8	169.3	± 1.2	kJ/mol	43.02478 ± 0.00086	51060-05-0*0
Methanetetraylbisamidogen	NCN (g)	445.3	445.7	± 1.8	kJ/mol	40.02418 ± 0.00081	2669-76-3*0
Methyl iodide	CH3I (l)		-12.19	± 0.19	kJ/mol	141.93899 ± 0.00083	74-88-4*590
Bromide	Br- (aq)		-120.99	± 0.15	kJ/mol	79.9045 ± 0.0010	24959-67-9*800
Difluoromethylene	CF2 (g, triplet)	43.32	44.04	± 0.43	kJ/mol	50.00751 ± 0.00080	2154-59-8*1
Difluoromethylene	CF2 (g, singlet)	-193.87	-193.40	± 0.43	kJ/mol	50.00751 ± 0.00080	2154-59-8*2
Ethyl iodide	CH3CH2I (l)	-9.30	-39.16	± 0.38	kJ/mol	155.9656 ± 0.0016	75-03-6*500
Fluoro(fluorooxy)methylene	FCOF (g, cis)	-135.5	-136.6	± 2.1	kJ/mol	66.00691 ± 0.00085	479587-30-9*2
Benzene	C6H6 (cr,l)	50.79	49.24	± 0.26	kJ/mol	78.1118 ± 0.0048	71-43-2*500
Nitrosyl ion	[NO]+ (g)	984.453	984.448	± 0.064	kJ/mol	30.00559 ± 0.00031	14452-93-8*0
(E)-Diazene cation	[HNNH]+ (g, trans)	1132.59	1125.69	± 0.74	kJ/mol	30.02881 ± 0.00020	59952-06-6*0
(E)-Diazene anion	[HNNH]- (g, trans)	269.3	262.4	± 1.7	kJ/mol	30.02991 ± 0.00020	59952-06-60
(Z)-Diazene	HNNH (g, cis)	229.60	222.47	± 0.83	kJ/mol	30.02936 ± 0.00020	15626-42-3*0
Diazenyl	N2H (g)	252.40	249.48	± 0.56	kJ/mol	29.02142 ± 0.00016	36882-13-0*0
Hydroxyaminiumyl	[NOH]+ (g)	1160.2	1157.2	± 1.5	kJ/mol	31.01353 ± 0.00032	63559-88-6*0
Hydrogen trioxide cation	[HOOO]+ (g, trans)	1067.7	1061.4	± 1.9	kJ/mol	49.00559 ± 0.00090	74241-49-9*1
Triiodide ion	[I3]- (aq)		-51.44	± 0.83	kJ/mol	380.713959 ± 0.000090	14900-04-0*800
Hydroxyamidogen	HNOH (g, cis)	123.5	117.0	± 1.4	kJ/mol	32.02202 ± 0.00034	13940-32-4*2
Hydroxyaminylium	[HNOH]+ (g, trans)	1020.2	1013.0	± 2.0	kJ/mol	32.02147 ± 0.00034	66097-71-0*1
Peroxynitrous acid	HOONO (g, cis,perp)	-0.56	-7.61	± 0.54	kJ/mol	63.01288 ± 0.00091	14691-52-2*2
Hydrogen trioxide anion	[OO(H)O]- (g)	27.7	22.3	± 1.5	kJ/mol	49.00669 ± 0.00090	89965-38-80
Dioxiranylidene	C(OO) (g)	189.0	189.8	± 1.8	kJ/mol	44.0095 ± 0.0010	138832-57-2*0
Deuterium atom	D (g)	219.804	221.717	± 0.000	kJ/mol	2.01410177800 ± 0.00000000040	16873-17-9*0
Hypoiodite	[IO]- (g)	-102.5	-104.4	± 1.2	kJ/mol	142.90442 ± 0.00030	15065-65-3*0
Oxoniumyl ion	[H2O]+ (g)	978.484	975.611	± 0.029	kJ/mol	18.01473 ± 0.00033	56583-62-1*0
Aminomethylium	[CH2NH2]+ (g)	764.0	752.1	± 1.8	kJ/mol	30.04865 ± 0.00085	488821-23-4*0
Aminomethylene	HCNH2 (g)	246.6	238.9	± 1.7	kJ/mol	29.04126 ± 0.00083	35430-17-2*0
Methylimidogen	H3CN (g)	323.8	316.0	± 1.6	kJ/mol	29.04126 ± 0.00083	27770-42-9*0
Methyleneamidogen anion	[H2CN]- (g)	193.1	189.3	± 1.2	kJ/mol	28.03387 ± 0.00082	28892-56-0*0
Aminomethylidyne	CNH2 (g)	372.3	368.8	± 1.5	kJ/mol	28.03332 ± 0.00082	84654-89-7*0
Fluorosyl ion	[FO]+ (g)	1342.40	1342.35	± 0.83	kJ/mol	34.99725 ± 0.00030	12763-67-6*0
Cyano cation	[CN]+ (g)	1779.2	1782.7	± 1.6	kJ/mol	26.01689 ± 0.00080	12539-57-0*0
Cyanide	[CN]- (g)	63.971	67.257	± 0.099	kJ/mol	26.01799 ± 0.00080	57-12-5*0
Methanol cation	[CH3OH]+ (g)	856.98	846.30	± 0.34	kJ/mol	32.04131 ± 0.00090	12538-91-9*0
Hydroxymethylene	HCOH (g, gauche triplet)	219.1	216.0	± 1.4	kJ/mol	30.02598 ± 0.00087	19710-56-6*3
Hydroxymethylene anion	[HCOH]- (g, trans)	148.2	145.3	± 1.8	kJ/mol	30.02653 ± 0.00087	207914-87-2*1
Isoformyl	COH (g)	217.59	217.98	± 0.70	kJ/mol	29.01804 ± 0.00086	71080-92-7*0
Hydroxymethyliumylidene	[COH]+ (g)	986.02	987.66	± 0.83	kJ/mol	29.01749 ± 0.00086	60528-75-8*0
Hydrotrioxy	HOOO (g, trans)	62.59	59.09	± 0.38	kJ/mol	49.00614 ± 0.00090	12500-78-6*1
Vinyl alcohol cation	[CH2CHOH]+ (g, syn)	787.5	776.4	± 1.1	kJ/mol	44.0520 ± 0.0017	57239-63-1*1
Acetyl anion	[CH3CO]- (g)	-43.8	-49.4	± 2.0	kJ/mol	43.0452 ± 0.0016	78944-68-0*0
Ketene	CH2CO (g, singlet)	-45.46	-48.57	± 0.15	kJ/mol	42.0367 ± 0.0016	463-51-4*2
COC vdW	(CO)(C) (g, triplet)	589.0	597.7	± 1.8	kJ/mol	40.0208 ± 0.0016	12071-24-81
Oxirene	O(CHCH) (g, singlet)	276.6	275.9	± 3.1	kJ/mol	42.0367 ± 0.0016	157-18-6*2
Oxirene	O(CHCH) (g, c-triplet)	391.9	387.7	± 2.8	kJ/mol	42.0367 ± 0.0016	157-18-6*12
Methylperoxy anion	[CH3OO]- (g)	-90.27	-100.41	± 0.99	kJ/mol	47.0339 ± 0.0010	35683-44-4*0
Dioxymethyl	H2COO (g)	113.6	106.6	± 1.2	kJ/mol	46.0254 ± 0.0010	56077-92-0*0
Formyloxoniumylidene	[HC(O)O]+ (g)	1015.2	1011.7	± 1.7	kJ/mol	45.0169 ± 0.0010	54375-27-8*0
Cyanic acid	HOCN (g)	-12.25	-14.86	± 1.01	kJ/mol	43.02478 ± 0.00086	420-05-3*0
Fulminic acid	HONC (g)	234.68	233.15	± 1.02	kJ/mol	43.02478 ± 0.00086	506-85-4*0
Cyanato cation	[NCO]+ (g)	1261.55	1262.32	± 0.59	kJ/mol	42.01629 ± 0.00086	17247-99-3*0
Isocyanate	[NCO]- (g)	-221.26	-221.38	± 0.57	kJ/mol	42.01739 ± 0.00086	71000-82-3*0
Nitrosomethylidyne	CNO (g)	388.6	390.0	± 1.7	kJ/mol	42.01684 ± 0.00086	82267-15-0*0
Oxazirinyl	C(NO) (g)	450.6	451.5	± 1.7	kJ/mol	42.01684 ± 0.00086	228850-18-8*0
Dimethylamine	(CH3)2NH (g)	6.02	-15.89	± 0.69	kJ/mol	45.0837 ± 0.0017	124-40-3*0
Trimethylamine	(CH3)3N (g)	4.54	-24.02	± 0.64	kJ/mol	59.1103 ± 0.0025	75-50-3*0
Isocyanogen	CNCN (g)	410.7	413.0	± 1.6	kJ/mol	52.0349 ± 0.0016	83951-85-3*0
Diisocyanogen	CNNC (g)	610.1	613.0	± 1.7	kJ/mol	52.0349 ± 0.0016	78800-21-2*0
Nitroxyl	NO3 (g)	79.35	74.09	± 0.19	kJ/mol	62.00494 ± 0.00090	12033-49-7*0
Hydrogen fluoride	HF (aq, 40 H2O)		-321.16	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*821
Difluorodibromomethane	CF2Br2 (g)	-366.8	-384.5	± 1.4	kJ/mol	209.8155 ± 0.0022	75-61-6*0
Dichlorodibromomethane	CCl2Br2 (g)	19.0	3.4	± 1.5	kJ/mol	242.7241 ± 0.0028	594-18-3*0
Bromodifluoromethane	CHF2Br (g)	-411.04	-424.23	± 0.56	kJ/mol	130.9194 ± 0.0013	1511-62-2*0
1,2-Difluoroacetylene	FCCF (g)	0.0	2.9	± 1.6	kJ/mol	62.0182 ± 0.0016	689-99-6*0
Fluoro(fluorooxy)methylene	FCOF (g, trans)	-38.7	-40.2	± 2.0	kJ/mol	66.00691 ± 0.00085	479587-30-9*1
Hydroxyde ion	[OH]- (aq)		-230.009	± 0.029	kJ/mol	17.00789 ± 0.00031	14280-30-9*800
Dihydrogen trioxide cation	[HOOOH]+ (g, trans)	928.9	919.6	± 1.9	kJ/mol	50.01353 ± 0.00091	161321-37-5*2
Phenylium	[C6H5]+ (g, triplet)	1251.8	1239.7	± 3.3	kJ/mol	77.1034 ± 0.0048	17333-73-2*1
Chlorobenzene cation	[C6H5Cl]+ (g)	942.52	928.60	± 0.61	kJ/mol	112.5561 ± 0.0049	55450-32-3*0
Chlorobenzene	C6H5Cl (cr,l)		11.26	± 0.59	kJ/mol	112.5566 ± 0.0049	108-90-7*500
Bromobenzene cation	[C6H5Br]+ (g)	995.1	973.8	± 1.3	kJ/mol	157.0074 ± 0.0049	55450-33-4*0
Iodobenzene	C6H5I (cr,l)	113.0	113.1	± 1.1	kJ/mol	204.0084 ± 0.0048	591-50-4*500
1,2-Dichloroethane	(CClH2)2 (g)	-118.15	-130.09	± 0.59	kJ/mol	98.9586 ± 0.0024	107-06-2*0
Hydroxyimidogen	NOH (g)	217.39	214.51	± 0.95	kJ/mol	31.01408 ± 0.00032	35337-59-8*0
Nitrous acid	HONO (g, cis)	-71.25	-77.61	± 0.39	kJ/mol	47.01348 ± 0.00061	7782-77-6*2
Hydroxyoxoammoniumyl	[HONO]+ (g, trans)	983.7	977.2	± 1.7	kJ/mol	47.01293 ± 0.00061	80371-48-8*1
Hydrogen nitroxylate	[HONO]- (g, cis)	-107.7	-112.3	± 2.0	kJ/mol	47.01403 ± 0.00061	24388-53-2*2
Hydroxydioxonitrate	[HNO3]- (g)	-191.2	-195.5	± 2.9	kJ/mol	63.01343 ± 0.00091	58875-09-5*0
Nitrosyl chloride	ClNO (g)	54.418	52.517	± 0.067	kJ/mol	65.45884 ± 0.00095	2696-92-6*0
Carbon atom anion	C- (g)	589.612	594.758	± 0.057	kJ/mol	12.01125 ± 0.00080	14337-00-9*0
Ammonium nitrate	(NH4)NO3 (cr,l)	-350.26	-365.22	± 0.19	kJ/mol	80.04344 ± 0.00095	6484-52-2*500
Dioxymethylidyne	COO (g)	295.1	296.3	± 2.1	kJ/mol	44.0095 ± 0.0010	791121-04-5*0
Carbon monoxide cation	[CO]+ (g)	1238.305	1241.585	± 0.026	kJ/mol	28.00955 ± 0.00085	12144-04-6*0
Propynylidyne cation	[C(CC)]+ (g)	1953.8	1960.9	± 2.2	kJ/mol	36.0316 ± 0.0024	154702-35-9*0
Dioxygen anion	[O2]- (g)	-43.38	-42.72	± 0.18	kJ/mol	31.99935 ± 0.00060	11062-77-4*0
Methylidyne radical	CH (g, quartet)	664.53	667.87	± 0.68	kJ/mol	13.01864 ± 0.00080	3315-37-5*2
Peroxyimidogen	NOO (g)	412.2	410.2	± 1.8	kJ/mol	46.00554 ± 0.00060	60488-31-50
Ethylene cation	[C2H4]+ (g)	1075.39	1068.24	± 0.15	kJ/mol	28.0526 ± 0.0016	34470-02-5*0
Hydrogen trioxide cation	[HOOO]+ (g, cis)	1083.1	1076.7	± 2.0	kJ/mol	49.00559 ± 0.00090	74241-49-9*2
Bifluoride	[FHF]- (g)	-710.3	-714.2	± 2.4	kJ/mol	39.005295 ± 0.000070	18130-74-0*0
Dibromide	[Br2]- (g)	-200.1	-214.2	± 2.0	kJ/mol	159.8085 ± 0.0020	12595-70-9*0
Hydrogen fluoride	HF (aq, 50 H2O)		-321.19	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*822
Aminomethyl	CH2NH2 (g)	159.63	148.74	± 1.01	kJ/mol	30.04920 ± 0.00085	10507-29-6*0
Methylamidogen	CH3NH (g)	187.81	177.08	± 0.89	kJ/mol	30.04920 ± 0.00085	15622-51-2*0
Oxadiazirine	O(NN) (g)	352.5	350.6	± 1.8	kJ/mol	44.01288 ± 0.00033	227934-45-4*0
Iminomethyl anion	[HCNH]- (g, trans)	239.0	235.2	± 2.0	kJ/mol	28.03387 ± 0.00082	90623-30-6*1
Hydrogen isocyanide	HNC (g)	191.58	191.96	± 0.57	kJ/mol	27.02538 ± 0.00081	6914-07-4*0
Methyleneoxonium	CH2OH2 (g)	158.0	149.2	± 4.1	kJ/mol	32.04186 ± 0.00090	177788-17-9*0
NON	NON (g)	543.8	540.6	± 1.8	kJ/mol	44.01288 ± 0.00033	227934-46-5*0
Aminylium	[NH2]+ (g)	1266.50	1263.78	± 0.18	kJ/mol	16.02207 ± 0.00016	15194-15-7*0
1-Hydroxyethylium	[CH3CHOH]+ (g)	609.24	594.82	± 0.40	kJ/mol	45.0600 ± 0.0017	18682-96-7*0
Chlorine atom cation	Cl+ (g)	1370.806	1372.602	± 0.002	kJ/mol	35.45215 ± 0.00090	24203-47-2*0
Acetaldehyde cation	[CH3CHO]+ (g)	832.10	822.12	± 0.32	kJ/mol	44.0520 ± 0.0017	36505-03-0*0
Dibromine monoxide	BrOBr (g)	121.1	104.6	± 1.3	kJ/mol	175.8074 ± 0.0020	21308-80-5*0
Ethynol anion	[HCCO]- (g)	-48.62	-47.37	± 0.87	kJ/mol	41.0293 ± 0.0016	64066-01-9*0
Dicarbon monoxide anion	[CCO]- (g)	152.6	156.3	± 1.4	kJ/mol	40.0213 ± 0.0016	87191-88-6*0
Nitrosyl nitrite	ONONO (g, t,c)	108.3	104.2	± 1.8	kJ/mol	76.01168 ± 0.00091	122413-35-8*2
Nitrogen atom cation	N+ (g)	1872.901	1875.682	± 0.024	kJ/mol	14.006191 ± 0.000070	14158-23-7*0
Dicarbon monoxide cation	[CCO]+ (g)	1431.5	1436.6	± 2.2	kJ/mol	40.0203 ± 0.0016	12287-08-0*0
COC vdW	(CO)(C) (g, singlet)	726.4	734.7	± 1.7	kJ/mol	40.0208 ± 0.0016	12071-24-82
C=O-C cation	[COC]+ (g, doublet)	1575.9	1582.9	± 2.3	kJ/mol	40.0203 ± 0.0016	83483-98-1*1
C=O=C anion	[COC]- (g)	550.4	554.2	± 2.1	kJ/mol	40.0213 ± 0.0016	87191-88-60
Hydrogen fluoride	HF (aq, 22 H2O)		-321.09	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*902
Formic acid cation	[HC(O)OH]+ (g, anti)	723.7	716.7	± 1.4	kJ/mol	46.0248 ± 0.0010	50614-05-6*2
Formic acid anion	[HC(O)OH]- (g, syn)	-254.5	-260.7	± 2.3	kJ/mol	46.0259 ± 0.0010	19066-82-1*1
OH-CO vdW complex	(OH)(CO) (g, vdW)	-80.30	-77.40	± 0.96	kJ/mol	45.0174 ± 0.0010	2564-85-4100
CO-HO vdW complex	(CO)(HO) (g, vdW)	-77.6	-73.6	± 1.8	kJ/mol	45.0174 ± 0.0010	2564-84-3100
H-CO2 vdW complex	(H)(CO2) (g, vdW)	-179.3	-178.4	± 2.2	kJ/mol	45.0174 ± 0.0010	2564-83-2100
Isocyanic acid cation	[HNCO]+ (g)	1002.80	1000.39	± 0.56	kJ/mol	43.02423 ± 0.00086	444010-28-0*0
Isofulminic acid cation	[HCNO]+ (g)	1215.4	1212.7	± 1.6	kJ/mol	43.02423 ± 0.00086	114766-65-3*0
Dioxaziridinyl	N(OO) (g)	354.2	351.7	± 1.6	kJ/mol	46.00554 ± 0.00060	66252-29-7*0
Acetic acid	CH3C(O)OH (aq, 1500 H2O)		-484.82	± 0.25	kJ/mol	60.0520 ± 0.0017	64-19-7*840
Acetyl chloride	CH3C(O)Cl (l)		-272.12	± 0.34	kJ/mol	78.4973 ± 0.0019	75-36-5*500
Glyoxal	(CHO)2 (g, trans)	-206.85	-212.48	± 0.59	kJ/mol	58.0361 ± 0.0017	107-22-2*1
Diazoethenylidene	NNCC (g)	656.9	659.5	± 3.0	kJ/mol	52.0349 ± 0.0016	130760-10-0*0
Isocyanomethylidyne	CNC (g)	670.3	674.7	± 4.0	kJ/mol	38.0281 ± 0.0016	53590-27-5*0
Tetrachloromethane	CCl4 (l)	-110.68	-130.09	± 0.75	kJ/mol	153.8215 ± 0.0037	56-23-5*500
Trifluoromethide	[CF3]- (g)	-638.7	-640.5	± 1.9	kJ/mol	69.00646 ± 0.00080	54128-17-5*0
Chloroform	CCl3H (l)		-133.95	± 0.64	kJ/mol	119.3767 ± 0.0028	67-66-3*590
Fluorotribromomethane	CBr3F (g)	-108.3	-132.3	± 1.6	kJ/mol	270.7211 ± 0.0031	353-54-8*0
Chlorotribromomethane	CBr3Cl (g)	75.9	53.0	± 1.6	kJ/mol	287.1754 ± 0.0032	594-15-0*0
Fluorochlorate	[ClF]- (g)	-257.9	-257.3	± 3.8	kJ/mol	54.45165 ± 0.00090	12272-56-9*0
Fluoromethyliumylidene	[CF]+ (g)	1122.67	1125.89	± 0.56	kJ/mol	31.00855 ± 0.00080	33412-11-2*0
Fluoromethylene	CHF (g)	148.33	148.61	± 0.46	kJ/mol	32.01704 ± 0.00080	13453-52-6*0
Chloride	Cl- (aq)		-166.993	± 0.023	kJ/mol	35.45325 ± 0.00090	16887-00-6*800
Hydrogen fluoride	HF (aq, 35 H2O)		-321.15	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*904
Ethyl iodide	CH3CH2I (g)	8.82	-7.06	± 0.38	kJ/mol	155.9656 ± 0.0016	75-03-6*0
1,2-Dichloroacetylene	ClCCCl (g)	230.5	233.8	± 1.9	kJ/mol	94.9268 ± 0.0024	7572-29-4*0
1,2-Dibromoacetylene	BrCCBr (g)	333.0	322.1	± 3.6	kJ/mol	183.8294 ± 0.0026	624-61-3*0
Fluoro(fluorooxy)methylene	FCOF (g, vdW triplet)	-100.8	-99.0	± 2.1	kJ/mol	66.00691 ± 0.00085	479587-30-9*101
Fluorooxomethylium	[FCO]+ (g)	724.2	723.9	± 1.5	kJ/mol	47.00795 ± 0.00085	38264-00-5*0
Fluoroisoformyl	COF (g)	-39.2	-33.8	± 1.8	kJ/mol	47.00850 ± 0.00085	1871-24-50
Dibromophosgene	COBr2 (g)	-97.59	-113.53	± 0.43	kJ/mol	187.8181 ± 0.0022	593-95-3*0
Benzene cation	[C6H6]+ (g)	992.58	976.11	± 0.26	kJ/mol	78.1113 ± 0.0048	34504-50-2*0
o-Benzyne	C6H4 (g)	469.7	460.8	± 1.4	kJ/mol	76.0960 ± 0.0048	462-80-6*0
o-Benzyne anion	[C6H4]- (g)	415.6	407.0	± 1.5	kJ/mol	76.0965 ± 0.0048	100569-88-8*0
Ammonia	NH3 (aq, undissoc)		-80.890	± 0.054	kJ/mol	17.03056 ± 0.00022	7664-41-7*1000
1,2-Dibromoethane	(CBrH2)2 (g)	-10.8	-37.6	± 1.3	kJ/mol	187.8612 ± 0.0026	106-93-4*0
1,1-Difluoroethane	CHF2CH3 (g)	-486.7	-500.5	± 5.8	kJ/mol	66.0500 ± 0.0016	75-37-6
1,1-Dichloroethane	CHCl2CH3 (g)	-114.7	-127.4	± 1.1	kJ/mol	98.9586 ± 0.0024	75-34-3*0
Ethylene anion	[C2H4]- (g, anti)	236.8	229.2	± 2.3	kJ/mol	28.0537 ± 0.0016	34527-91-8*1
Peroxyimidogen anion	[NOO]- (g)	162.7	160.3	± 1.7	kJ/mol	46.00609 ± 0.00060	60488-31-5*0
Ethylidyne	CH3C (g, quartet)	642.0	637.5	± 2.3	kJ/mol	27.0452 ± 0.0016	67624-57-1*2
Nitric acid	HNO3 (aq, 1000 H2O)		-206.28	± 0.19	kJ/mol	63.01288 ± 0.00091	7697-37-2*839
Acetylene anion	[HCCH]- (g, trans)	359.5	359.3	± 3.0	kJ/mol	26.0378 ± 0.0016	50443-89-5*1
Nirous oxide cation	[NNO]+ (g)	1329.68	1326.78	± 0.12	kJ/mol	44.01233 ± 0.00033	12269-46-4*0
Ethynylium	[C2H]+ (g)	1687.64	1690.97	± 0.18	kJ/mol	25.0288 ± 0.0016	16456-59-0*0
Methylammonium	[CH3NH3]+ (g)	628.8	609.7	± 2.5	kJ/mol	32.06453 ± 0.00091	17000-00-9*0
Hydrogen chloride	HCl (aq, 2000 H2O)		-166.684	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*841
Nitric acid	HNO3 (cr,l)	-178.98	-173.25	± 0.19	kJ/mol	63.01288 ± 0.00091	7697-37-2*500
Oxadiazirine anion	[O(NN)]- (g)	99.7	100.0	± 2.6	kJ/mol	44.01343 ± 0.00033	350586-31-1*0
Iminomethyl anion	[HCNH]- (g, cis)	254.3	250.5	± 2.0	kJ/mol	28.03387 ± 0.00082	90623-30-6*2
Hydrogen cyanide cation	[HCN]+ (g)	1442.54	1442.07	± 0.21	kJ/mol	27.02483 ± 0.00081	12601-62-6*0
Dihydrogen trioxide cation	[HOOOH]+ (g, c,t)	939.3	930.1	± 2.0	kJ/mol	50.01353 ± 0.00091	161321-37-5*3
Dioxygenyl ion monohydrate	[(H2O)(O2)]+ (g)	831.3	824.5	± 3.0	kJ/mol	50.01353 ± 0.00091	11083-61-7*0
Water dimer	(H2O)2 (g)	-492.20	-499.61	± 0.11	kJ/mol	36.03056 ± 0.00066	25655-83-8*0
Methyleneoxonium cation	[CH2OH2]+ (g)	829.9	819.7	± 4.5	kJ/mol	32.04131 ± 0.00090	177788-17-90
Hydroxymethylide	[CH2OH]- (g)	9.8	3.2	± 1.8	kJ/mol	31.03447 ± 0.00088	55830-71-2*0
Formaldehyde cation	[H2CO]+ (g)	945.25	941.72	± 0.13	kJ/mol	30.02543 ± 0.00087	54288-05-0*0
Hydroxymethylene cation	[HCOH]+ (g, cis)	986.9	983.4	± 1.8	kJ/mol	30.02543 ± 0.00087	135395-06-1*2
Hydroxymethylene cation	[HCOH]+ (g, gauche quartet)	1481.9	1479.1	± 2.1	kJ/mol	30.02543 ± 0.00087	135395-06-1*3
Hydroxymethylene anion	[HCOH]- (g, cis)	161.6	159.7	± 1.9	kJ/mol	30.02653 ± 0.00087	207914-87-2*2
Hydroxymethylene anion	[HCOH]- (g, gauche quartet)	333.7	333.0	± 2.5	kJ/mol	30.02653 ± 0.00087	207914-87-2*3
Aquacarbon	H2OC (g, triplet)	441.4	439.5	± 2.1	kJ/mol	30.02598 ± 0.00087	81434-73-3*1
Aquacarbon	H2OC (g, singlet vdW)	470.2	467.5	± 2.4	kJ/mol	30.02598 ± 0.00087	81434-73-3*102
Isoformyl anion	[COH]- (g)	50.8	53.4	± 2.7	kJ/mol	29.01859 ± 0.00086	81747-63-9*0
Cyclopropane	CH2(CH2CH2) (g)	70.78	53.64	± 0.52	kJ/mol	42.0797 ± 0.0024	75-19-4*0
Trioxodinitrate anion	[ONNO2]- (g, vdW)	-103.0	-106.9	± 2.9	kJ/mol	76.01223 ± 0.00091	194856-62-7*100
1-Cyclopropen-1-yl	CH2(CHC) (g)	528.55	523.96	± 0.87	kJ/mol	39.0559 ± 0.0024	19528-44-0*0
Cyclopropenyl	CH(CHCH) (g)	491.42	486.81	± 0.88	kJ/mol	39.0559 ± 0.0024	28933-84-8*0
(Z)-Diazene cation	[HNNH]+ (g, cis)	1157.3	1150.5	± 1.4	kJ/mol	30.02881 ± 0.00020	86631-37-0*0
2-Hydroxyethylium	[CH2CH2OH]+ (g, gauche)	1024.8	1012.2	± 2.3	kJ/mol	45.0600 ± 0.0017	38607-31-7*1
Hydrogen chloride	HCl (aq, 75 H2O)		-165.558	± 0.027	kJ/mol	36.46064 ± 0.00090	7647-01-0*825
Ethoxy	CH3CH2O (g)	1.95	-11.47	± 0.50	kJ/mol	45.0605 ± 0.0017	2154-50-9*0
Hydrogen fluoride	HF (l)		-302.43	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*590
Ethyloxoniumylidene	[CH3CH2O]+ (g)	989.1	975.4	± 1.8	kJ/mol	45.0600 ± 0.0017	54387-07-4*0
(Z)-Diazene anion	[HNNH]- (g, cis)	284.1	277.6	± 1.7	kJ/mol	30.02991 ± 0.00020	86631-37-00
Dioxygenyl fluoride cation	[FOO]+ (g)	1215.1	1212.7	± 3.1	kJ/mol	50.99665 ± 0.00060	139584-95-5*0
1-Hydrazinylium-1-yl	[H2NN]+ (g)	1145.2	1138.2	± 1.5	kJ/mol	30.02881 ± 0.00020	63986-30-1*0
Nitrosyl nitrite anion	[ONONO]- (g, sym)	-100.9	-104.0	± 4.4	kJ/mol	76.01223 ± 0.00091	122413-35-81
Dioxaziridinyl anion	[N(OO)]- (g)	295.1	292.6	± 1.7	kJ/mol	46.00609 ± 0.00060	66252-31-1*0
C=O-C cation	[COC]+ (g, quartet)	1812.2	1816.2	± 2.3	kJ/mol	40.0203 ± 0.0016	83483-98-1*2
Isodiazene anion	[H2NN]- (g)	387.1	380.3	± 1.8	kJ/mol	30.02991 ± 0.00020	63986-30-10
Oxirene cation	[O(CHCH)]+ (g)	1109.7	1106.1	± 5.3	kJ/mol	42.0361 ± 0.0016	94664-69-4*0
2,4,5-Trioxa-1,3-diazabicyclo[1.1.1]pentane	N(O3)N (g)	602.6	593.3	± 2.0	kJ/mol	76.01168 ± 0.00091	224950-18-9*0
Formic acid anion	[HC(O)OH]- (g, anti)	-239.4	-245.1	± 2.4	kJ/mol	46.0259 ± 0.0010	19066-82-1*2
Dinitrogen tetraoxide	O2NNO2 (g)	20.06	10.77	± 0.13	kJ/mol	92.0111 ± 0.0012	10544-72-6*0
Dioxirane cation	[H2C(OO)]+ (g)	1051.3	1043.7	± 2.2	kJ/mol	46.0248 ± 0.0010	232262-10-1*0
Dioxymethyl cation	[H2COO]+ (g)	1076.0	1069.2	± 1.9	kJ/mol	46.0248 ± 0.0010	232262-11-2*0
Dioxymethylene	HCOO (g, cis)	332.1	329.9	± 5.9	kJ/mol	45.0174 ± 0.0010	438586-67-5*2
Hydroxyoxoammoniumyl	[HONO]+ (g, cis)	1014.8	1008.5	± 1.8	kJ/mol	47.01293 ± 0.00061	80371-48-8*2
Hydrogen fluoride	HF (aq, 10 H2O)		-320.91	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*815
Hydrogen fluoride	HF (aq, 18 H2O)		-321.06	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*901
Hydrogen nitroxylate	[HONO]- (g, trans)	-106.8	-110.7	± 2.0	kJ/mol	47.01403 ± 0.00061	24388-53-2*1
Aminyliumyl	[NH]+ (g)	1658.98	1659.91	± 0.25	kJ/mol	15.014131 ± 0.000099	19067-62-0*0
Water	H2O (l)		-285.825	± 0.027	kJ/mol	18.01528 ± 0.00033	7732-18-5*590
Nitrosomethyliumylidene	[CNO]+ (g)	1509.5	1511.7	± 2.1	kJ/mol	42.01629 ± 0.00086	67197-19-7*0
Fulminate	[CNO]- (g)	59.4	59.6	± 2.0	kJ/mol	42.01739 ± 0.00086	28269-67-2*0
Azido radical	N3 (g)	452.51	449.92	± 0.73	kJ/mol	42.02022 ± 0.00021	12596-60-0*0
Acetic acid	CH3C(O)OH (l)	-484.00	-483.58	± 0.20	kJ/mol	60.0520 ± 0.0017	64-19-7*500
Acetic acid	CH3C(O)OH (aq)		-485.09	± 0.25	kJ/mol	60.0520 ± 0.0017	64-19-7*800
Acetic acid	CH3C(O)OH (aq, 75 H2O)		-484.61	± 0.25	kJ/mol	60.0520 ± 0.0017	64-19-7*825
Acetic acid	CH3C(O)OH (aq, 700 H2O)		-484.80	± 0.25	kJ/mol	60.0520 ± 0.0017	64-19-7*835
Carbon dioxide	CO2 (g, triplet)	48.9	49.6	± 2.4	kJ/mol	44.0095 ± 0.0010	124-38-9*1
Glyoxal	(CHO)2 (g, cis)	-188.42	-193.86	± 0.73	kJ/mol	58.0361 ± 0.0017	107-22-2*2
Glyoxal	(CHO)2 (g)	-206.85	-212.41	± 0.59	kJ/mol	58.0361 ± 0.0017	107-22-2*0
Hydroxylamine	NH2OH (g, cis)	-14.7	-25.2	± 1.5	kJ/mol	33.02996 ± 0.00037	7803-49-8*2
Hydroxylamine cation	[NH2OH]+ (g)	858.0	848.1	± 1.8	kJ/mol	33.02941 ± 0.00037	62675-55-2*0
Isocyanogen anion	[CNCN]- (g, trans)	383.9	387.6	± 2.5	kJ/mol	52.0354 ± 0.0016	83951-85-31
Diisocyanogen cation	[CNNC]+ (g, trans)	1823.0	1825.8	± 3.5	kJ/mol	52.0343 ± 0.0016	78800-21-21
Cyanomethylidyne	CCN (g)	673.9	678.3	± 4.4	kJ/mol	38.0281 ± 0.0016	4120-02-9*0
Hydrogen bromide	HBr (aq, 5000 H2O)		-120.81	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*844
Diazomethylene	CNN (g)	572.8	573.5	± 3.2	kJ/mol	40.02418 ± 0.00081	2468-81-7*0
Hydrogen fluoride	HF (aq, 30 H2O)		-321.13	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*820
Diiodide	[I2]- (g)	-178.13	-180.72	± 0.48	kJ/mol	253.809489 ± 0.000060	12190-71-5*0
Trifluoride ion	[F3]- (g)	-363.3	-364.3	± 3.2	kJ/mol	56.9957582 ± 0.0000015	25730-99-8*0
Azide ion	[N3]- (g)	194.2	190.6	± 1.1	kJ/mol	42.02077 ± 0.00021	14343-69-2*0
Dihydrogen cation	[H2]+ (g)	1488.364	1488.480	± 0.000	kJ/mol	2.01533 ± 0.00014	12184-90-6*0
Fluorochlorobromomethane	CHFClBr (g)	-219.3	-231.8	± 5.5	kJ/mol	147.3737 ± 0.0016	593-98-6*0
Iodine atom cation	I+ (g)	1115.549	1115.149	± 0.006	kJ/mol	126.903921 ± 0.000030	22541-93-1*0
Fluoromethyliumyl	[CHF]+ (g)	1116.9	1117.2	± 2.1	kJ/mol	32.01649 ± 0.00080	89877-52-1*0
Fluoromethylene anion	[CHF]- (g)	95.94	96.47	± 0.63	kJ/mol	32.01759 ± 0.00080	71267-42-0*0
Polytetrafluoroethylene	C2F4 (s)		-829.48	± 0.60	kJ/mol	100.0150 ± 0.0016	9002-84-0*591
2-Cyclopropyn-1-ylidene	C(CC) (g, triplet)	905.0	911.9	± 2.0	kJ/mol	36.0321 ± 0.0024	102508-15-6*1
Aminium	[NH3]+ (g)	944.272	937.317	± 0.030	kJ/mol	17.03001 ± 0.00022	19496-55-0*0
Hydrogen fluoride	HF (aq, 60 H2O)		-321.21	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*823
Nitrous acid	HONO (g)	-73.044	-78.701	± 0.079	kJ/mol	47.01348 ± 0.00061	7782-77-6*0
Bromoacetylene	HCCBr (g)	282.4	275.9	± 2.2	kJ/mol	104.9333 ± 0.0019	593-61-3*0
Nitroxyl cation	[H2NO]+ (g)	946.32	939.19	± 0.84	kJ/mol	32.02147 ± 0.00034	51375-41-80
Methane cation	[CH4]+ (g)	1150.93	1143.81	± 0.27	kJ/mol	16.04191 ± 0.00085	20741-88-2*0
Formyl fluoride cation	[HFCO]+ (g)	816.3	813.0	± 1.3	kJ/mol	48.01589 ± 0.00086	99766-68-4*0
Formyl fluoride	[FCO]- (g)	-405.4	-403.9	± 1.7	kJ/mol	47.00905 ± 0.00085	62227-71-8*0
Fluoroisoformyl cation	[COF]+ (g)	1347.4	1348.9	± 2.2	kJ/mol	47.00795 ± 0.00085	1871-25-60
Trihydrogen dioxide anion	[HOHOH]- (g)	-487.4	-494.9	± 1.2	kJ/mol	35.02317 ± 0.00064	12501-19-8*0
Hydrogen difluoride	FHF (g)	-203.6	-203.8	± 2.5	kJ/mol	39.004746 ± 0.000070	12528-21-1*0
Hydrogen bromide	HBr (aq, 600 H2O)		-120.51	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*834
Hydrogen chloride	HCl (aq, 100 H2O)		-165.759	± 0.025	kJ/mol	36.46064 ± 0.00090	7647-01-0*828
Dioxygen difluoride cation	[FOOF]+ (g, trans)	1292.9	1289.0	± 4.7	kJ/mol	69.99506 ± 0.00060	7783-44-01
Hydroxyaminylium	[HNOH]+ (g, cis)	1049.2	1042.1	± 2.0	kJ/mol	32.02147 ± 0.00034	66097-71-0*2
Hydroxyamidogen anion	[HNOH]- (g)	91.2	85.4	± 2.1	kJ/mol	32.02257 ± 0.00034	66097-71-00
Ethylidene anion	[CH3CH]- (g)	328.4	320.9	± 2.1	kJ/mol	28.0537 ± 0.0016	35829-99-3*0
Formaldehyde anion	[H2CO]- (g)	-24.0	-27.7	± 2.2	kJ/mol	30.02653 ± 0.00087	27837-46-3*0
Hypofluorous acid anion	[HOF]- (g)	152.7	152.0	± 3.8	kJ/mol	36.00629 ± 0.00031	36505-07-4*0
Hydrogen trioxide cation	[HOOO]+ (g)	1067.7	1061.4	± 1.9	kJ/mol	49.00559 ± 0.00090	74241-49-9*0
Bifluoride	[FFH]- (g)	-477.2	-477.6	± 3.2	kJ/mol	39.005295 ± 0.000070	18130-74-00
Hydrogen chloride	HCl (aq, 150 H2O)		-165.981	± 0.025	kJ/mol	36.46064 ± 0.00090	7647-01-0*829
Bromine dioxide	OBrO (g)	167.8	158.2	± 2.8	kJ/mol	111.9028 ± 0.0012	21255-83-4*0
Ethyloxoniumyl	[CH3CH2OH]+ (g)	795.42	778.30	± 0.76	kJ/mol	46.0679 ± 0.0017	34480-55-2*0
Ethanol	CH3CH2OH (l)	-269.27	-277.03	± 0.22	kJ/mol	46.0684 ± 0.0017	64-17-5*500
Hypochlorous acid anion	[HOCl]- (g)	194.2	193.9	± 3.0	kJ/mol	52.46059 ± 0.00095	34524-94-2*0
Trioxodinitrate anion	[ONNO2]- (g, non-vdW only)	-85.5	-92.6	± 2.7	kJ/mol	76.01223 ± 0.00091	194856-62-7*1
1-Hydroxyethyl anion	[CH3CHOH]- (g)	-19.7	-33.1	± 2.5	kJ/mol	45.0610 ± 0.0017	88032-18-2*0
Dioxygen difluoride cation	[FOOF]+ (g, cis)	1295.7	1291.7	± 4.7	kJ/mol	69.99506 ± 0.00060	7783-44-02
Dinitrogen cation	[N2]+ (g)	1503.311	1503.312	± 0.001	kJ/mol	28.01293 ± 0.00014	13966-04-6*0
Acetylene anion	[HCCH]- (g, cis)	383.0	383.3	± 3.2	kJ/mol	26.0378 ± 0.0016	50443-89-5*2
Hypofluorous acid cation	[HOF]+ (g)	1142.02	1139.09	± 0.90	kJ/mol	36.00519 ± 0.00031	90243-22-4*0
Acetaldehyde anion	[CH3CHO]- (g)	-59.3	-69.8	± 2.5	kJ/mol	44.0531 ± 0.0017	60427-04-5*0
Nirous oxide anion	[NNO]- (g)	100.3	97.7	± 2.2	kJ/mol	44.01343 ± 0.00033	12274-12-3*0
Ketene cation	[CH2CO]+ (g)	882.11	879.10	± 0.15	kJ/mol	42.0361 ± 0.0016	64999-16-2*0
Ketene anion	[CH2CO]- (g)	-14.7	-17.7	± 2.4	kJ/mol	42.0372 ± 0.0016	56391-79-8*0
Hydrogen chloride	HCl (aq, 140 H2O)		-165.947	± 0.026	kJ/mol	36.46064 ± 0.00090	7647-01-0*907
Oxoethenylium	[HCCO]+ (g)	1139.0	1141.7	± 2.5	kJ/mol	41.0282 ± 0.0016	92056-63-8*0
Hydrooxonitrate	[HNO]- (g)	80.0	77.1	± 1.2	kJ/mol	31.01463 ± 0.00032	66057-02-1*0
Ammonium bromide	(NH4)Br (cr)	-253.76	-270.33	± 0.17	kJ/mol	97.9425 ± 0.0010	12124-97-9*510
Methylammoniumyl	[CH3NH2]+ (g)	866.9	853.2	± 2.4	kJ/mol	31.05659 ± 0.00088	34516-31-9*0
Nitrosyl nitrite anion	[ONONO]- (g, t,c)	-97.4	-100.6	± 4.4	kJ/mol	76.01223 ± 0.00091	122413-35-82
Methylamine anion	[CH3NH2]- (g)	69.1	54.9	± 4.0	kJ/mol	31.05769 ± 0.00088	81096-79-9*0
Nitrate	[NO3]- (aq)		-206.60	± 0.19	kJ/mol	62.00549 ± 0.00090	14797-55-8*800
Ethynol cation	[HCCOH]+ (g)	1063.0	1060.8	± 2.6	kJ/mol	42.0361 ± 0.0016	84005-02-7*0
Methyl hydroperoxide cation	[CH3OOH]+ (g)	834.7	822.1	± 5.7	kJ/mol	48.0407 ± 0.0010	112465-88-0*0
Hydrogen chloride	HCl (aq, 1500 H2O)		-166.638	± 0.025	kJ/mol	36.46064 ± 0.00090	7647-01-0*840
Methoxyoxoniumylidene	[CH3OO]+ (g)	1010.9	1002.5	± 2.4	kJ/mol	47.0328 ± 0.0010	86475-50-5*0
Carbon atom	C (g, singlet)	833.319	838.466	± 0.057	kJ/mol	12.01070 ± 0.00080	7440-44-0*2
Aminomethyl anion	[CH2NH2]- (g)	212.1	201.1	± 2.8	kJ/mol	30.04975 ± 0.00085	74215-21-7*0
Hypobromous acid cation	[HOBr]+ (g)	975.23	964.65	± 0.60	kJ/mol	96.9108 ± 0.0010	154804-02-1*0
Nitric acid cation	[HNO3]+ (g)	1029.30	1020.24	± 0.70	kJ/mol	63.01233 ± 0.00091	272109-63-4*0
Methylaminilium	[CH3NH]+ (g)	1135.2	1125.2	± 2.5	kJ/mol	30.04865 ± 0.00085	49784-84-1*0
Dioxirane anion	[H2C(OO)]- (g)	-170.5	-177.9	± 3.9	kJ/mol	46.0259 ± 0.0010	157-26-60
Dioxymethyl anion	[H2COO]- (g)	57.2	51.2	± 2.5	kJ/mol	46.0259 ± 0.0010	93207-29-5*0
Hydrogen fluoride	HF (aq, 23 H2O)		-321.09	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*903
Hydrogen fluoride	HF (aq, 55.51 H2O)		-321.20	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*891
Nitrosyl nitrate	ONONO2 (g, cis)	59.5	51.8	± 2.2	kJ/mol	92.0111 ± 0.0012	15969-55-8*2
Chloroniumyl ion	[HCl]+ (g)	1137.797	1137.731	± 0.006	kJ/mol	36.46009 ± 0.00090	12258-94-5*0
Formyloxy	HC(O)O (g)	-123.60	-125.06	± 0.61	kJ/mol	45.0174 ± 0.0010	16499-21-1*0
Dioxiranyl	HC(OO) (g)	216.2	212.8	± 2.1	kJ/mol	45.0174 ± 0.0010	120595-16-6*0
Methanimine cation	[H2CNH]+ (g)	1055.9	1048.8	± 2.2	kJ/mol	29.04071 ± 0.00083	65130-65-6*0
Dioxymethylene	HCOO (g, trans)	359.0	356.6	± 5.9	kJ/mol	45.0174 ± 0.0010	438586-67-5*1
Methanimine anion	[H2CNH]- (g)	228.7	221.4	± 2.5	kJ/mol	29.04181 ± 0.00083	127593-73-1*0
Aminomethyliumyl	[HCNH2]+ (g)	1040.8	1033.1	± 2.6	kJ/mol	29.04071 ± 0.00083	89302-94-3*0
Aminomethylene anion	[HCNH2]- (g)	357.1	350.2	± 2.6	kJ/mol	29.04181 ± 0.00083	207914-86-1*0
Diazene ion	[N2H]- (g)	176.5	175.1	± 2.2	kJ/mol	29.02197 ± 0.00016	71004-29-0*0
Methylaminyliumyl	[H3CN]+ (g, quartet)	1478.4	1471.2	± 2.6	kJ/mol	29.04071 ± 0.00083	56924-51-7*2
Methylimidogen anion	[H3CN]- (g)	322.3	314.6	± 1.8	kJ/mol	29.04181 ± 0.00083	82539-34-2*0
Oxazirinyl cation	[C(NO)]+ (g)	1566.7	1567.4	± 2.8	kJ/mol	42.01629 ± 0.00086	*228850-18-8
Oxazirinyl anion	[C(NO)]- (g)	449.8	450.6	± 2.8	kJ/mol	42.01739 ± 0.00086	28269-68-3
Acetic acid	CH3C(O)OH (g, syn-anti equilib)	-418.75	-432.87	± 0.64	kJ/mol	60.0520 ± 0.0017	64-19-7*0
Methyleneaminylium	[H2CN]+ (g, triplet)	1457.2	1453.6	± 2.5	kJ/mol	28.03277 ± 0.00082	53518-13-1*1
Hydrogen fluoride	HF (aq, 37 H2O)		-321.15	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*890
Hydrogen chloride	HCl (aq, 74 H2O)		-165.548	± 0.027	kJ/mol	36.46064 ± 0.00090	7647-01-0*953
Methyl formate	HC(O)OCH3 (g)	-344.54	-357.80	± 0.59	kJ/mol	60.0520 ± 0.0017	107-31-3*0
Trinitrogen cation	[N3]+ (g)	1519.4	1516.9	± 1.2	kJ/mol	42.01967 ± 0.00021	12185-03-4*0
Methylidyne anion	[CH]- (g)	474.07	477.41	± 0.65	kJ/mol	13.01919 ± 0.00080	28604-54-8*0
Oxalic acid	(COOH)2 (g)	-710.8	-721.4	± 2.1	kJ/mol	90.0349 ± 0.0020	144-62-7*0
Fluorine atom cation	F+ (g)	1758.316	1760.614	± 0.057	kJ/mol	18.99785462 ± 0.00000050	14701-13-4*0
Aminomethyliumylidene	[CNH2]+ (g)	1168.9	1165.7	± 2.6	kJ/mol	28.03277 ± 0.00082	86784-42-1*0
Isocyanogen anion	[CNCN]- (g, cis)	386.6	389.5	± 2.9	kJ/mol	52.0354 ± 0.0016	83951-85-32
Ozone cation	[OOO]+ (g)	1352.872	1351.065	± 0.042	kJ/mol	47.99765 ± 0.00090	12596-82-6*0
Diisocyanogen cation	[CNNC]+ (g, cis)	1835.0	1837.7	± 3.5	kJ/mol	52.0343 ± 0.0016	78800-21-22
Hydroxyimidogen anion	[NOH]- (g)	232.7	230.2	± 2.5	kJ/mol	31.01463 ± 0.00032	35337-59-80
Ethylene anion	[C2H4]- (g, syn)	237.7	231.6	± 2.4	kJ/mol	28.0537 ± 0.0016	34527-91-8*2
Hydrogen cyanide anion	[HCN]- (g)	239.6	240.0	± 2.7	kJ/mol	27.02593 ± 0.00081	12334-27-9*0
Hydrogen fluoride	HF (aq, 22.2 H2O)		-321.09	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*888
Hydrogen bromide	HBr (aq, 2000 H2O)		-120.70	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*841
Dihydrooxooxygen cation	[(H2O)O]+ (g)	994.6	988.0	± 1.8	kJ/mol	34.01413 ± 0.00062	177329-59-8*0
Trifluorine cation	[F3]+ (g)	1538.5	1536.5	± 3.4	kJ/mol	56.9946610 ± 0.0000015	64710-22-1*0
Hypochlorous acid cation	[HOCl]+ (g)	993.8	990.7	± 3.2	kJ/mol	52.45949 ± 0.00095	71606-47-8*0
Dioxaziridinyl cation	[N(OO)]+ (g)	1361.3	1358.7	± 2.0	kJ/mol	46.00499 ± 0.00060	66252-29-70
Dioxygenyl fluoride anion	[FOO]- (g)	-252.0	-252.2	± 3.1	kJ/mol	50.99775 ± 0.00060	23553-17-5*0
Hydrogen chloride	HCl (aq, 2439 H2O)		-166.714	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*951
Hydrogen peroxide cation	[H2O2]+ (g, cis)	931.0	924.2	± 1.1	kJ/mol	34.01413 ± 0.00062	12325-10-9*2
Imidogen anion	[NH]- (g)	322.62	322.67	± 0.17	kJ/mol	15.015229 ± 0.000099	23841-33-0*0
Fluorobromomethane	CH2FBr (g)	-198.0	-212.4	± 5.5	kJ/mol	112.9290 ± 0.0013	373-52-4*0
Chlorobromomethane	CH2ClBr (g)	-30.7	-44.7	± 5.5	kJ/mol	129.3833 ± 0.0016	74-97-5*0
Nitrogen hydride oxide	H3NO (g)	72.3	61.1	± 1.7	kJ/mol	33.02996 ± 0.00037	38544-48-8*0
Fluorodibromomethane	CHFBr2 (g)	-160.0	-179.5	± 5.5	kJ/mol	191.8250 ± 0.0022	1868-53-7*0
Bromodichloromethane	CHCl2Br (g)	-39.8	-51.5	± 5.5	kJ/mol	163.8280 ± 0.0022	75-27-4*0
Chlorodibromomethane	CHClBr2 (g)	15.8	-3.0	± 5.5	kJ/mol	208.2793 ± 0.0023	124-48-1*0
Hydrazinylium	[N2H3]+ (g)	969.6	958.4	± 1.2	kJ/mol	31.03675 ± 0.00025	37369-93-0*0
Difluorochlorobromomethane	CF2ClBr (g)	-431.4	-442.2	± 5.5	kJ/mol	165.3642 ± 0.0016	353-59-3*0
Dichlorofluorobromomethane	CCl2FBr (g)	-230.2	-240.0	± 5.5	kJ/mol	181.8185 ± 0.0022	353-58-2*0
Dibromofluorochloromethane	CBr2FCl (g)	-170.8	-187.4	± 5.5	kJ/mol	226.2698 ± 0.0023	353-55-9*0
Dinitrogen pentoxide	O2NONO2 (cr,l)		-41.14	± 0.43	kJ/mol	108.0105 ± 0.0015	10102-03-1*500
Difluoromethyliumyl	[CF2]+ (g)	908.56	908.99	± 0.95	kJ/mol	50.00696 ± 0.00080	54250-40-7*0
Fluoroniumyl ion	[HF]+ (g)	1275.571	1275.803	± 0.058	kJ/mol	20.005795 ± 0.000070	12381-92-9*0
2-Cyclopropyn-1-ylidene	C(CC) (g, singlet)	999.1	1005.9	± 2.7	kJ/mol	36.0321 ± 0.0024	102508-15-6*2
Oxywater	(H2O)O (g)	64.8	58.4	± 1.5	kJ/mol	34.01468 ± 0.00062	171363-09-0*0
Hydrogen fluoride	HF (aq, 55 H2O)		-321.20	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*905
Difluorophosgene cation	[COF2]+ (g)	653.26	650.62	± 0.62	kJ/mol	66.00636 ± 0.00085	73256-56-1*0
Difluorophosgene anion	[COF2]- (g)	-603.5	-605.4	± 2.9	kJ/mol	66.00745 ± 0.00085	474815-26-4*0
Dibromine	Br2 (aq)		-2.16	± 0.21	kJ/mol	159.8080 ± 0.0020	7726-95-6*800
Bromosyl ion	[BrO]+ (g)	1139.8	1132.1	± 1.3	kJ/mol	95.9029 ± 0.0010	142315-39-7*0
Nitryl ion	[ONO]+ (g)	961.75	958.19	± 0.20	kJ/mol	46.00499 ± 0.00060	14522-82-8*0
Fluorosyl fluoride	FFO (g)	189.2	189.5	± 4.8	kJ/mol	53.99621 ± 0.00030	86825-57-2*0
Dibromophosgene	COBr2 (l)		-144.26	± 0.96	kJ/mol	187.8181 ± 0.0022	593-95-3*590
2-Chloroethanol	ClCH2CH2OH (l)		-315.10	± 0.54	kJ/mol	80.5132 ± 0.0019	107-07-3*590
Hydrogen bromide	HBr (aq, 2570 H2O)		-120.74	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*952
2-Bromoethanol	BrCH2CH2OH (l)		-275.00	± 0.47	kJ/mol	124.9645 ± 0.0019	540-51-2*590
Nitroxyl anion	[H2NO]- (g)	49.3	42.3	± 1.8	kJ/mol	32.02257 ± 0.00034	51375-41-8*0
Hydroxyoxoammoniumyl	[HONO]+ (g)	983.7	977.2	± 1.7	kJ/mol	47.01293 ± 0.00061	80371-48-8*0
Hydrogen bromide	HBr (aq, 3000 H2O)		-120.75	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*842
Phenylium	[C6H5]+ (g, singlet)	1148.74	1136.84	± 0.95	kJ/mol	77.1034 ± 0.0048	17333-73-2*2
Methanol anion	[CH3OH]- (g)	54.7	45.6	± 3.1	kJ/mol	32.04241 ± 0.00090	68474-04-4*0
Fluorobenzene	C6H5F (cr,l)	-152.44	-150.02	± 1.02	kJ/mol	96.1023 ± 0.0048	462-06-6*500
Ammonium chloride	(NH4)Cl (cr)	-311.727	-314.889	± 0.063	kJ/mol	53.49120 ± 0.00095	12125-02-9*510
1-Ethylium-1-yl	[CH3CH]+ (g)	1185.7	1178.6	± 2.6	kJ/mol	28.0526 ± 0.0016	85944-79-2*0
Bromobenzene	C6H5Br (cr,l)		60.2	± 1.3	kJ/mol	157.0079 ± 0.0049	108-86-1*500
Isobutane	CH3CH(CH3)CH3 (g)	-106.76	-135.36	± 0.40	kJ/mol	58.1222 ± 0.0033	75-28-5
Acetone	CH3C(O)CH3 (cr,l)	-244.33	-247.45	± 0.37	kJ/mol	58.0791 ± 0.0025	67-64-1*500
2-Propanol	CH3CHOHCH3 (cr,l)	-305.35	-318.15	± 0.36	kJ/mol	60.0950 ± 0.0025	67-63-0*500
Monoammonium succinate	(CH2COOH)2(NH3) (cr)		-1067.95	± 0.72	kJ/mol	135.1186 ± 0.0035	38457-08-8*510
Diammonium succinate	(CH2COOH)2(NH3)2 (cr)		-1182.49	± 0.48	kJ/mol	152.1492 ± 0.0035	2226-88-2*510
1,2-Dichloroethane	(CClH2)2 (cr,l)		-165.24	± 0.59	kJ/mol	98.9586 ± 0.0024	107-06-2*500
Methyliumylidene	[CH]+ (g)	1620.15	1623.49	± 0.28	kJ/mol	13.01809 ± 0.00080	24361-82-8*0
1,1-Dichloroethane	CHCl2CH3 (cr,l)		-158.1	± 1.1	kJ/mol	98.9586 ± 0.0024	75-34-3*500
Nitric acid trihydrate	HNO3(H2O)3 (cr,l)	-1062.05	-1055.20	± 0.22	kJ/mol	117.0587 ± 0.0019	13444-83-2*500
Oxygen difluoride anion	[FOF]- (g)	-194.0	-194.4	± 3.8	kJ/mol	53.99675 ± 0.00030	7783-41-70
Ethane anion	[C2H6]- (g)	8.4	-7.0	± 3.2	kJ/mol	30.0696 ± 0.0017	54064-82-3*0
NON cation	[NON]+ (g)	1444.1	1444.3	± 2.7	kJ/mol	44.01233 ± 0.00033	227934-46-50
Hydrotrioxy	HOOO (g)	62.59	58.30	± 0.38	kJ/mol	49.00614 ± 0.00090	12500-78-6*0
Hydrogen chloride	HCl (aq, 1000 H2O)		-166.567	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*839
Carbon dioxide anion	[CO2]- (g)	-340.2	-339.7	± 2.4	kJ/mol	44.0100 ± 0.0010	14485-07-5*0
Bromoniumyl	[HBr]+ (g)	1097.67	1089.82	± 0.15	kJ/mol	80.9114 ± 0.0010	12258-64-9*0
Dioxiranylidene cation	[C(OO)]+ (g)	1409.3	1411.7	± 6.0	kJ/mol	44.0090 ± 0.0010	138832-57-20
Hydraziniumyl	[H2NNH2]+ (g)	887.4	873.7	± 2.5	kJ/mol	32.04469 ± 0.00031	20771-51-1*0
Dioxiranylidene anion	[C(OO)]- (g, open)	-111.6	-111.1	± 3.5	kJ/mol	44.0100 ± 0.0010	138832-58-30
Hydrazoic acid cation	[HNNN]+ (g)	1333.94	1328.26	± 0.89	kJ/mol	43.02761 ± 0.00022	58852-14-5*0
Dioxygen	O2 (g, singlet)	94.410	94.383	± 0.000	kJ/mol	31.99880 ± 0.00060	7782-44-7*2
NON anion	[NON]- (g)	498.1	495.6	± 2.7	kJ/mol	44.01343 ± 0.00033	227934-47-60
Hydrazine anion	[H2NNH2]- (g)	210.9	197.0	± 3.7	kJ/mol	32.04579 ± 0.00031	65391-88-0*0
Nitrato	[NO3]+ (g)	1290.51	1285.80	± 0.86	kJ/mol	62.00439 ± 0.00090	133057-96-2*0
Oxadiazirine	[O(NN)]+ (g)	1512.8	1510.3	± 2.8	kJ/mol	44.01233 ± 0.00033	227934-45-40
Dioxymethylidyne cation	[COO]+ (g, doublet)	1434.5	1437.8	± 3.7	kJ/mol	44.0090 ± 0.0010	791121-04-52
Peroxynitrous acid	HOONO (g)	-6.13	-12.76	± 0.38	kJ/mol	63.01288 ± 0.00091	14691-52-2*0
Peroxyimidogen cation	[NOO]+ (g)	1405.5	1402.7	± 3.8	kJ/mol	46.00499 ± 0.00060	60488-32-60
Acetic acid	CH3C(O)OH (g, anti)	-397.7	-411.5	± 1.2	kJ/mol	60.0520 ± 0.0017	64-19-7*2
Hydrazine	H2NNH2 (cr,l)	57.34	50.77	± 0.18	kJ/mol	32.04524 ± 0.00031	302-01-2*500
Acetic acid	CH3C(O)OH (aq, 1000 H2O)		-484.81	± 0.25	kJ/mol	60.0520 ± 0.0017	64-19-7*839
Dioxymethylidyne cation	[(C)(OO)]+ (g, vdW quartet)	1384.7	1389.0	± 5.6	kJ/mol	44.0090 ± 0.0010	791121-04-5101
Hydrochlorate ion	[HCl]- (g)	-25.5	-24.5	± 3.0	kJ/mol	36.46119 ± 0.00090	63099-75-2*0
Nitric acid monohydrate	HNO3(H2O) (cr,l)	-479.13	-472.64	± 0.19	kJ/mol	81.0282 ± 0.0012	13444-82-1*500
1-Ethenylium-1-yl	[CCH2]+ (g)	1508.6	1509.0	± 2.7	kJ/mol	26.0367 ± 0.0016	80541-07-7*0
Methyl formate	HC(O)OCH3 (l)		-386.15	± 0.59	kJ/mol	60.0520 ± 0.0017	107-31-3*500
Ethylene glycol	(CH2OH)2 (cr,l)	-448.68	-455.20	± 0.38	kJ/mol	62.0678 ± 0.0018	107-21-1*500
Carbon dioxide cation	[CO2]+ (g, quartet)	1327.1	1328.0	± 3.2	kJ/mol	44.0090 ± 0.0010	12181-61-2*1
Nitric acid	HNO3 (aq, 1 H2O)		-186.81	± 0.19	kJ/mol	63.01288 ± 0.00091	7697-37-2*801
Oxalic acid	(COOH)2 (cr)		-819.28	± 0.47	kJ/mol	90.0349 ± 0.0020	144-62-7*500
Hydrazoic acid anion	[HNNN]- (g)	317.4	311.0	± 2.5	kJ/mol	43.02871 ± 0.00022	203264-98-6*0
Dimethylamine	(CH3)2NH (l)		-41.10	± 0.73	kJ/mol	45.0837 ± 0.0017	124-40-3*500
Trimethylamine	(CH3)3N (l)		-45.74	± 0.62	kJ/mol	59.1103 ± 0.0025	75-50-3*500
Cyanogen cation	[NCCN]+ (g)	1598.26	1600.49	± 0.44	kJ/mol	52.0343 ± 0.0016	37354-81-7*0
Cyanogen anion	[NCCN]- (g)	281.4	284.5	± 2.7	kJ/mol	52.0354 ± 0.0016	11118-88-0*0
Isocyanogen cation	[CNCN]+ (g)	1652.8	1654.1	± 1.7	kJ/mol	52.0343 ± 0.0016	133415-63-1*0
Diisocyanogen anion	[CNNC]- (g)	456.7	463.6	± 5.7	kJ/mol	52.0354 ± 0.0016	78800-22-30
Diazoethenylidene cation	[NNCC]+ (g)	1777.0	1779.1	± 6.1	kJ/mol	52.0343 ± 0.0016	130760-10-00
Diazoethenylidene anion	[NNCC]- (g)	536.0	538.5	± 5.8	kJ/mol	52.0354 ± 0.0016	130760-11-10
3H-diazirin-3-ylidene-methylene	CC(NN) (g)	833.6	836.0	± 3.6	kJ/mol	52.0349 ± 0.0016	204253-88-3*0
Carbon monoxide anion	[CO]- (g)	39.1	42.4	± 3.1	kJ/mol	28.01065 ± 0.00085	12539-63-8*0
Isocyanomethyliumylidene	[CNC]+ (g)	1612.1	1617.7	± 6.2	kJ/mol	38.0276 ± 0.0016	78271-45-1*0
Isocyanomethylidyne anion	[CNC]- (g)	478.1	481.8	± 5.9	kJ/mol	38.0287 ± 0.0016	53590-27-50
Cyanomethyliumylidene	[CCN]+ (g)	1710.1	1715.6	± 6.3	kJ/mol	38.0276 ± 0.0016	76619-90-4*0
Cyanomethylidyne anion	[CCN]- (g)	405.6	409.3	± 6.0	kJ/mol	38.0287 ± 0.0016	12373-35-2*0
2,3-didehydro-1H-azirin-1-yl	N(CC) (g)	721.4	725.5	± 5.1	kJ/mol	38.0281 ± 0.0016	439586-06-8*0
Cyanoaminyliumyl	[NCN]+ (g)	1660.9	1662.3	± 6.0	kJ/mol	40.02363 ± 0.00081	316122-03-9*0
Cyanoamidogen anion	[NCN]- (g)	205.7	205.7	± 1.8	kJ/mol	40.02473 ± 0.00081	189879-95-6*0
Diazomethyliumyl	[CNN]+ (g)	1636.6	1638.3	± 6.1	kJ/mol	40.02363 ± 0.00081	307495-90-5*0
Diazomethylene anion	[CNN]- (g)	401.7	401.9	± 3.3	kJ/mol	40.02473 ± 0.00081	205498-92-6*0
3H-Diazirin-3-ylidene	C(NN) (g)	580.2	580.6	± 4.4	kJ/mol	40.02418 ± 0.00081	253308-70-2*0
Ethynylene cation	[C2]+ (g)	1968.3	1974.9	± 2.5	kJ/mol	24.0209 ± 0.0016	12595-79-8*0
Trifluorine	F3 (g)	86.4	87.1	± 3.7	kJ/mol	56.9952096 ± 0.0000015	73455-86-4*0
Oxygen atom	O (g, singlet)	436.666	438.523	± 0.002	kJ/mol	15.99940 ± 0.00030	17778-80-2*2
Carbide	[C2]- (g)	504.90	511.48	± 0.54	kJ/mol	24.0219 ± 0.0016	12595-78-7*0
Trioxygen difluoride	FOOOF (g)	116.8	111.3	± 7.8	kJ/mol	85.99501 ± 0.00090	16829-28-0*0
Formaldehyde	H2CO (cr, paraformaldehyde)		-179.2	± 1.6	kJ/mol	30.02598 ± 0.00087	50-00-0*500
Chlorosyl ion	[ClO]+ (g)	1150.58	1150.42	± 0.79	kJ/mol	51.45155 ± 0.00095	12301-79-0*0
Methylene chloride	CH2Cl2 (l)		-123.27	± 0.61	kJ/mol	84.9320 ± 0.0020	75-09-2*590
Chlorine fluoride cation	[ClF]+ (g)	1165.45	1165.64	± 0.64	kJ/mol	54.45055 ± 0.00090	12432-44-9*0
Hydroxylamine	NH2OH (aq, undissoc)		-97.1	± 2.2	kJ/mol	33.02996 ± 0.00037	7803-49-8*1000
Azide ion	[N3]- (aq)		272.76	± 0.53	kJ/mol	42.02077 ± 0.00021	14343-69-2*800
1,2-Propadien-1-ylium-1-yl-3-ylidene	[CCC]+ (g, lin only)	1974.0	1982.7	± 3.0	kJ/mol	36.0316 ± 0.0024	118090-85-0*1
Fluorosyl fluoride cation	[FFO]+ (g)	1409.3	1409.6	± 6.3	kJ/mol	53.99566 ± 0.00030	86825-50-50
Ethanide	[CH3CH2]- (g)	156.3	144.6	± 2.5	kJ/mol	29.0616 ± 0.0016	25013-41-6*0
Hydrogen chloride	HCl (aq, 3000 H2O)		-166.743	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*842
Hexafluoroethane	CF3CF3 (g)	-1342.2	-1350.5	± 1.7	kJ/mol	138.0118 ± 0.0016	76-16-4
Hydrazide	[N2H3]- (g)	252.9	243.0	± 2.5	kJ/mol	31.03785 ± 0.00025	25415-88-7*0
Ethane cation	[C2H6]+ (g)	1043.49	1029.94	± 0.63	kJ/mol	30.0685 ± 0.0017	34488-65-8*0
Difluoromethylene anion	[CF2]- (g)	-211.12	-209.90	± 0.63	kJ/mol	50.00805 ± 0.00080	66212-40-6*0
Methylamine	CH3NH2 (l)		-44.69	± 0.58	kJ/mol	31.05714 ± 0.00088	74-89-5*500
Fluoromethylidyne anion	[CF]- (g)	200.6	204.1	± 2.1	kJ/mol	31.00965 ± 0.00080	33412-12-3*0
Dihydrogen cation	[H2]+ (g, ortho)	1489.060	1488.480	± 0.000	kJ/mol	2.01533 ± 0.00014	12184-90-6*1
Iodine atom	I (g, 2P3/2 only)	107.157	106.757	± 0.002	kJ/mol	126.904470 ± 0.000030	14362-44-8*1
Hydrofluorate ion	[HF]- (g)	-74.4	-73.9	± 2.7	kJ/mol	20.006892 ± 0.000070	37249-79-9*0
Deuterium atom cation	D+ (g)	1532.211	1534.123	± 0.000	kJ/mol	2.01355319809 ± 0.00000000040	14464-47-2*0
Dibromine monoxide	BrBrO (g)	180.7	164.9	± 2.2	kJ/mol	175.8074 ± 0.0020	68322-97-4*0
1,2-Difluoroacetylene cation	[FCCF]+ (g)	1078.7	1081.7	± 2.0	kJ/mol	62.0177 ± 0.0016	268566-70-7*0
Hydrogen fluoride	HF (aq, 400 H2O)		-321.50	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*832
Ammonia anion	[NH3]- (g)	38.3	31.4	± 2.8	kJ/mol	17.03111 ± 0.00022	76211-32-00
Deuterium hydride cation	[HD]+ (g)	1490.498	1490.587	± 0.000	kJ/mol	3.021493 ± 0.000070	12181-16-7*0
Methane anion	[CH4]- (g)	10.4	3.1	± 4.2	kJ/mol	16.04301 ± 0.00085	27680-53-1*0
Nitric acid	HNO3 (aq, 3 H2O)		-197.72	± 0.19	kJ/mol	63.01288 ± 0.00091	7697-37-2*805
Dioxofluorine	OFO (g)	522.96	521.22	± 0.90	kJ/mol	50.99720 ± 0.00060	175861-93-5*0
Oxygen difluoride cation	[FOF]+ (g)	1292.20	1289.68	± 0.67	kJ/mol	53.99566 ± 0.00030	39432-25-2*0
Fluorosyl fluoride anion	[FFO]- (g)	-53.5	-53.0	± 6.1	kJ/mol	53.99675 ± 0.00030	86825-57-20
1-Ethylium-1-ylidene	[CH3C]+ (g)	1329.8	1326.7	± 2.8	kJ/mol	27.0447 ± 0.0016	78949-84-5*0
2-Iodoethanol	ICH2CH2OH (l)		-207.2	± 2.4	kJ/mol	171.9650 ± 0.0017	624-76-0*590
1,3-Butadiyne cation	[HCCCCH]+ (g)	1440.67	1441.52	± 0.89	kJ/mol	50.0581 ± 0.0032	55468-55-8*0
Deuterium hydride	HD (g)	0.328	0.319	± 0.000	kJ/mol	3.022042 ± 0.000070	13983-20-5*0
Tricarbon dioxide cation	[OCCCO]+ (g)	925.4	929.0	± 1.5	kJ/mol	68.0304 ± 0.0025	151528-67-5*0
Tricarbon dioxide anion	[OCCCO]- (g)	-133.1	-129.4	± 3.0	kJ/mol	68.0314 ± 0.0025	109362-94-9
Benzene anion	[C6H6]- (g)	211.6	199.3	± 3.7	kJ/mol	78.1124 ± 0.0048	34562-85-1*0
Hydrogen bromide	HBr (aq, 1000 H2O)		-120.60	± 0.15	kJ/mol	80.9119 ± 0.0010	10035-10-6*839
o-Benzyne cation	[C6H4]+ (g)	1398.9	1391.4	± 3.0	kJ/mol	76.0954 ± 0.0048	70220-84-7*0
Methylene anion	[CH2]- (g)	328.28	328.72	± 0.55	kJ/mol	14.02713 ± 0.00081	50928-07-9*0
Toluene	C6H5CH3 (g)	73.69	50.41	± 0.37	kJ/mol	92.1384 ± 0.0056	108-88-3*0
Toluene	C6H5CH3 (l)	20.12	12.36	± 0.36	kJ/mol	92.1384 ± 0.0056	108-88-3*500
Iodine monochloride	ICl (cr)	-36.511	-35.537	± 0.063	kJ/mol	162.35717 ± 0.00090	7790-99-0*510
Nitrogen sesquioxide cation	[ONNO2]+ (g)	1031.0	1027.6	± 4.1	kJ/mol	76.01113 ± 0.00091	10544-73-70
Methanol	CH3OH (l)	-235.06	-238.40	± 0.18	kJ/mol	32.04186 ± 0.00090	67-56-1*500
Dioxygen difluoride anion	[FOOF]- (g)	-235.6	-235.8	± 5.6	kJ/mol	69.99615 ± 0.00060	7783-45-10
Iodobenzene cation	[C6H5I]+ (g)	1022.9	1007.4	± 1.1	kJ/mol	204.0078 ± 0.0048	38406-85-8*0
Hydrogen chloride	HCl (aq, 200 H2O)		-166.106	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*830
Nitrosobenzene	C6H5NO (g)	215.6	198.6	± 1.5	kJ/mol	107.1100 ± 0.0048	586-96-9*0
n-Hexane	C6H14 (l)	-179.83	-198.49	± 0.48	kJ/mol	86.1754 ± 0.0049	110-54-3*500
2-Butyne	(CH3)CC(CH3) (g)	158.72	145.76	± 0.79	kJ/mol	54.0904 ± 0.0032	503-17-3
1-Butene	CH2CHCH2CH3 (g)	20.92	-0.03	± 0.48	kJ/mol	56.1063 ± 0.0032	106-98-9
cis-2-Butene	CH3CHCHCH3 (g)	13.94	-7.33	± 0.53	kJ/mol	56.1063 ± 0.0032	590-18-1
trans-2-Butene	CH3CHCHCH3 (g)	9.38	-11.18	± 0.51	kJ/mol	56.1063 ± 0.0032	624-64-6
Isobutene	CH2C(CH3)2 (g)	3.46	-17.60	± 0.53	kJ/mol	56.1063 ± 0.0032	115-11-7
Carbon dioxide cation	[CO2]+ (g)	936.102	936.937	± 0.023	kJ/mol	44.0090 ± 0.0010	12181-61-2*0
Hydrogen fluoride	HF (aq, 18.5 H2O)		-321.06	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*887
2-Propynylium	[CH2CCH]+ (g)	1190.95	1188.05	± 0.48	kJ/mol	39.0554 ± 0.0024	21540-27-2*0
Heptane	C7H16 (l)	-201.45	-223.91	± 0.74	kJ/mol	100.2019 ± 0.0057	142-82-5*500
Octane	C8H18 (l)	-226.61	-249.73	± 0.79	kJ/mol	114.2285 ± 0.0065	111-65-9*500
2,2,4-Trimethylpentane	(CH3)2CHCH2C(CH3)3 (l)	-224.4	-258.8	± 1.5	kJ/mol	114.2285 ± 0.0065	540-84-1*500
Trifluoroethylene	C2HF3 (g)	-482.8	-487.8	± 8.4	kJ/mol	82.0245 ± 0.0016	359-11-5
Difluorovinylidene	CH2CF2 (g)	-326.0	-332.9	± 2.4	kJ/mol	64.0341 ± 0.0016	75-38-7
Norbornadiene	(CHCH)CHCH2CH(CHCH) (g)	237.9	212.5	± 1.2	kJ/mol	92.1384 ± 0.0056	121-46-0*0
Norbornadiene	(CHCH)CHCH2CH(CHCH) (l)		179.13	± 1.02	kJ/mol	92.1384 ± 0.0056	121-46-0*500
2,3-Butanedione	(CH3CO)2 (cr,l)		-365.47	± 0.55	kJ/mol	86.0892 ± 0.0033	431-03-8*500
2,3-Butanedione	(CH3CO)2 (g)	-309.97	-326.54	± 0.82	kJ/mol	86.0892 ± 0.0033	431-03-8*0
Succinic acid	(CH2COOH)2 (cr,l)	-918.54	-940.26	± 0.13	kJ/mol	118.0880 ± 0.0034	110-15-6*500
1,2-Difluoroethane	(CFH2)2 (g)	-437.0	-450.4	± 5.1	kJ/mol	66.0500 ± 0.0016	624-72-6
Formic acid	HC(O)OH (cr,l)	-431.64	-424.81	± 0.22	kJ/mol	46.0254 ± 0.0010	64-18-6*500
1,2-Diiodoethane	(CIH2)2 (g)	87.79	73.12	± 0.90	kJ/mol	281.8621 ± 0.0016	624-73-7*0
1,2-Diiodoethane	(CIH2)2 (cr,l)		9.26	± 0.60	kJ/mol	281.8621 ± 0.0016	624-73-7*500
Ethylidyne anion	[CH3C]- (g)	459.1	454.9	± 2.8	kJ/mol	27.0458 ± 0.0016	117768-70-4*0
1-Propynylium	[CH3CC]+ (g)	1538.	1536.	± 16.	kJ/mol	39.0554 ± 0.0024	24858-94-4*0
1,1-Dibromoethane	CHBr2CH3 (g)	-9.3	-36.3	± 7.8	kJ/mol	187.8612 ± 0.0026	557-91-5*0
Xenon hydride cation	[XeH]+ (g)	1038.37	1036.60	± 0.94	kJ/mol	132.2974 ± 0.0200	37276-91-8
Bromine atom	Br (g, 2P3/2 only)	117.914	111.852	± 0.056	kJ/mol	79.9040 ± 0.0010	10097-32-2*1
Bromodioxy	BrOO (g)	119.3	110.2	± 4.0	kJ/mol	111.9028 ± 0.0012	67177-47-3*0
Hydrazine monohydrate	(H2NNH2)(H2O) (l)		-242.57	± 0.19	kJ/mol	50.06052 ± 0.00053	7803-57-8*500
Iodine monochloride	ICl (l)		-24.048	± 0.063	kJ/mol	162.35717 ± 0.00090	7790-99-0*590
Hydroxymethylene	HCOH (g)	111.96	108.20	± 0.43	kJ/mol	30.02598 ± 0.00087	19710-56-6*0
Acetaldehyde	CH3CHO (cr,l)	-186.88	-191.59	± 0.36	kJ/mol	44.0526 ± 0.0017	75-07-0*500
Deuterium molecule cation	[D2]+ (g)	1492.286	1492.361	± 0.000	kJ/mol	4.02765497609 ± 0.00000000080	12184-84-8*0
Hydroxylamine	NH2OH (g)	-33.12	-43.48	± 0.49	kJ/mol	33.02996 ± 0.00037	7803-49-8*0
1,2-Propadien-1-yl-3-ylidene anion	[CCC]- (g)	622.2	629.6	± 1.7	kJ/mol	36.0326 ± 0.0024	109292-47-9*0
Trihydrogen cation	[H3]+ (g, para)	1110.304	1106.697	± 0.013	kJ/mol	3.02327 ± 0.00021	28132-48-1*2
Hydrogen peroxide	H2O2 (cr,l)	-193.148	-187.327	± 0.081	kJ/mol	34.01468 ± 0.00062	7722-84-1*500
Deuteride	D- (g)	146.991	148.904	± 0.002	kJ/mol	2.01465035791 ± 0.00000000040	14452-69-8*0
Iodine atom	I (g, 2P1/2 only)	198.109	197.709	± 0.002	kJ/mol	126.904470 ± 0.000030	14362-44-8*2
Ethyl bromide	CH3CH2Br (l)	-55.59	-91.12	± 0.29	kJ/mol	108.9651 ± 0.0019	74-96-4*500
Hydrogen fluoride	HF (aq, 45 H2O)		-321.18	± 0.17	kJ/mol	20.006343 ± 0.000070	7664-39-3*906
Vinyl iodide	CH2CHI (g)	139.4	130.6	± 1.2	kJ/mol	153.9497 ± 0.0016	593-66-8
Oxygen fluoride	OOF2 (g)	75.5	71.3	± 7.8	kJ/mol	69.99561 ± 0.00060	183051-89-0*0
Diatomic bromine cation	[Br2]+ (g)	1060.33	1045.38	± 0.23	kJ/mol	159.8075 ± 0.0020	12595-71-0*0
Difluorine cation	[F2]+ (g)	1514.301	1514.475	± 0.012	kJ/mol	37.9962578 ± 0.0000010	12184-86-0*0
Tribromide ion	[Br3]- (aq)		-129.57	± 0.25	kJ/mol	239.7125 ± 0.0030	14522-80-6*800
Acetic acid	CH3C(O)OH (aq, 500 H2O)		-484.79	± 0.25	kJ/mol	60.0520 ± 0.0017	64-19-7*833
Tetraazatetrahedrane	N4 (g)	763.9	757.4	± 1.7	kJ/mol	56.02696 ± 0.00028	12596-63-3*0
Dihydrogen cation	[H2]+ (g, para)	1488.364	1488.480	± 0.000	kJ/mol	2.01533 ± 0.00014	12184-90-6*2
Acetic acid	CH3C(O)OH (aq, 10000 H2O)		-484.84	± 0.25	kJ/mol	60.0520 ± 0.0017	64-19-7*850
Trioxirane	O(OO) (g)	275.1	272.5	± 1.6	kJ/mol	47.99820 ± 0.00090	153851-84-4*0
Carbon atom	C (g, triplet only)	711.388	716.873	± 0.057	kJ/mol	12.01070 ± 0.00080	7440-44-0*1
Tetrazete	N4 (g)	769.6	763.6	± 2.4	kJ/mol	56.02696 ± 0.00028	42851-09-2*0
Tricarbon dioxide	OCCCO (cr,l)	-134.5	-119.4	± 1.4	kJ/mol	68.0309 ± 0.0025	504-64-3*500
Hydrogen iodide	HI (aq)		-56.824	± 0.090	kJ/mol	127.912410 ± 0.000076	10034-85-2*800
Chlorine atom	Cl (g, 2P3/2 only)	119.621	121.228	± 0.002	kJ/mol	35.45270 ± 0.00090	22537-15-1*1
Tetrabromomethane	CBr4 (cr, monoclinic)		47.5	± 1.3	kJ/mol	331.6267 ± 0.0041	558-13-4*500
Tetraiodomethane	CI4 (cr, monoclinic)		392.5	± 8.0	kJ/mol	519.62858 ± 0.00081	507-25-5*500
Ammonium hydroxide	NH4OH (aq, undissoc)		-366.715	± 0.062	kJ/mol	35.04584 ± 0.00047	1336-21-6*1000
Fluorine atom	F (g, 2P3/2 only)	77.268	79.053	± 0.057	kJ/mol	18.99840320 ± 0.00000050	14762-94-8*1
Formaldehyde	H2CO (aq)		-171.14	± 0.59	kJ/mol	30.02598 ± 0.00087	50-00-0*800
Methyl bromide	CH3Br (l)	-56.71	-59.72	± 0.20	kJ/mol	94.9385 ± 0.0013	74-83-9*590
Cyanamide	H2NCN (cr)		58.84	± 0.55	kJ/mol	42.04006 ± 0.00082	420-04-2*500
1-Butyne	CH3CH2CCH (g)	178.97	165.39	± 0.85	kJ/mol	54.0904 ± 0.0032	107-00-6
Cyclobutene	C4H6 (g)	173.9	156.9	± 1.6	kJ/mol	54.0904 ± 0.0032	822-35-5
Dihydrogen	H2 (g, ortho)	1.417	0.019	± 0.000	kJ/mol	2.01588 ± 0.00014	1333-74-0*1
1-Hydroxyethyl	CH3CHOH (g)	-41.86	-55.29	± 0.62	kJ/mol	45.0605 ± 0.0017	2348-46-1*0
2-Propanol	CH3CHOHCH3 (g)	-248.70	-272.80	± 0.37	kJ/mol	60.0950 ± 0.0025	67-63-0*0
1,2-Propadien-1-ylium-1-yl-3-ylidene	[CCC]+ (g)	1953.8	1960.9	± 2.2	kJ/mol	36.0316 ± 0.0024	118090-85-0*0
(Z)-1,2-Diiodoethene	C2H2I2 (g)	215.76	207.48	± 0.45	kJ/mol	279.8462 ± 0.0016	590-26-1
(E)-1,2-Diiodoethene	C2H2I2 (g)	214.87	207.48	± 0.45	kJ/mol	279.8462 ± 0.0016	590-27-2
1,3-Cyclopentadiene	C5H6 (g)	118.2	101.3	± 2.5	kJ/mol	66.1011 ± 0.0040	542-92-7
Formaldehyde	H2CO (cr, polyoxymethylene)		-170.88	± 0.21	kJ/mol	30.02598 ± 0.00087	50-00-0*501
Hydroxylamine	NH2OH (cr,l)		-107.50	± 0.65	kJ/mol	33.02996 ± 0.00037	7803-49-8*500
1,2-Dibromoethane	(CBrH2)2 (cr,l)		-79.3	± 1.3	kJ/mol	187.8612 ± 0.0026	106-93-4*500
Xenon cation	Xe+ (g)	1170.354	1170.354	± 0.006	kJ/mol	131.2895 ± 0.0200	24203-25-6*0
Hydrazoic acid	HNNN (aq, undissoc)		257.79	± 0.54	kJ/mol	43.02816 ± 0.00022	7782-79-8*1000
Hydrazoic acid	HNNN (aq)		272.76	± 0.53	kJ/mol	43.02816 ± 0.00022	7782-79-8*800
Krypton hydride cation	[KrH]+ (g)	1106.49	1104.71	± 0.70	kJ/mol	84.8074 ± 0.1000	37276-90-7
Nitrogen atom anion	N- (g)	489.2	491.5	± 4.2	kJ/mol	14.007289 ± 0.000070	17778-87-9*0
Oxirene	O(CHCH) (g)	276.6	275.9	± 3.1	kJ/mol	42.0367 ± 0.0016	157-18-6*0
Dioxygen difluoride cation	[FOOF]+ (g)	1292.9	1289.7	± 4.7	kJ/mol	69.99506 ± 0.00060	7783-44-00
Phosgene	COCl2 (cr,l, I+liquid)		-242.63	± 0.28	kJ/mol	98.9155 ± 0.0020	75-44-5*501
Phosgene	COCl2 (cr,l, II+liquid)	-255.33	-242.63	± 0.28	kJ/mol	98.9155 ± 0.0020	75-44-5*502
Oxirene	O(CHCH) (g, triplet)	389.9	386.6	± 2.8	kJ/mol	42.0367 ± 0.0016	157-18-6*1
Nitrosyl nitrite anion	[ONONO]- (g)	-100.8	-104.0	± 4.4	kJ/mol	76.01223 ± 0.00091	122413-35-80
Diisocyanogen cation	[CNNC]+ (g, trans-cis equilib)	1823.0	1826.0	± 3.5	kJ/mol	52.0343 ± 0.0016	78800-21-20
2-Hydroxyethylium	[CH2CH2OH]+ (g)	1019.7	1007.6	± 1.7	kJ/mol	45.0600 ± 0.0017	38607-31-7*0
Cyanogen	NCCN (cr,l)	273.91	289.16	± 0.44	kJ/mol	52.0349 ± 0.0016	460-19-5*500
cis-Dinitrogen dioxide	ONNO (g, cis)	172.82	171.06	± 0.14	kJ/mol	60.01228 ± 0.00062	57932-56-6*0
Vinyl alcohol	CH2CHOH (g, syn-anti equilib)	-112.40	-122.77	± 0.91	kJ/mol	44.0526 ± 0.0017	557-75-5*0
Acetylene anion	[HCCH]- (g)	359.5	359.3	± 3.0	kJ/mol	26.0378 ± 0.0016	50443-89-5*0
2-Iodoethanol	ICH2CH2OH (g)	-132.0	-150.2	± 2.5	kJ/mol	171.9650 ± 0.0017	624-76-0*0
Dihydrogen	H2 (g, para)	0.000	-0.058	± 0.000	kJ/mol	2.01588 ± 0.00014	1333-74-0*2
Dioxygen	O2 (g, triplet only)	0.000	0.000	± 0.000	kJ/mol	31.99880 ± 0.00060	7782-44-7*1
Vinyl alcohol cation	[CH2CHOH]+ (g, anti-syn equilib)	779.3	768.4	± 1.3	kJ/mol	44.0520 ± 0.0017	57239-63-1*0
Diazene anion	[HNNH]- (g, trans-cis equilib)	269.3	262.5	± 1.7	kJ/mol	30.02991 ± 0.00020	100429-75-2*1
Ethylidene	CH3CH (g)	361.5	354.5	± 1.2	kJ/mol	28.0532 ± 0.0016	4218-50-2*0
Carbon atom	C (diamond)	2.391	1.863	± 0.044	kJ/mol	12.01070 ± 0.00080	7440-44-0*501
Dihydrogen trioxide cation	[HOOOH]+ (g)	928.9	920.2	± 1.9	kJ/mol	50.01353 ± 0.00091	161321-37-5*0
Bromine atom	Br (g, 2P1/2 only)	161.998	155.936	± 0.056	kJ/mol	79.9040 ± 0.0010	10097-32-2*2
Diazene anion	[HNNH]- (g, trans-cis-iso equilib)	269.3	262.5	± 1.7	kJ/mol	30.02991 ± 0.00020	100429-75-2*0
Imidogen	NH (g, triplet only)	358.74	358.79	± 0.17	kJ/mol	15.014680 ± 0.000099	13774-92-0*1
Iodine monochloride	ICl (cr,l)	-36.511	-35.537	± 0.063	kJ/mol	162.35717 ± 0.00090	7790-99-0*500
Ethyl chloride	CH3CH2Cl (cr,l)	-134.04	-135.66	± 0.22	kJ/mol	64.5138 ± 0.0019	75-00-3*500
Methanediol	CH2(OH)2 (g)	-379.20	-392.59	± 0.96	kJ/mol	48.0413 ± 0.0010	463-57-0*0
Isocyanogen fluoride	FNC (g)	299.3	301.1	± 2.3	kJ/mol	45.01584 ± 0.00080	16992-26-0*0
Imidogen	NH (g, singlet)	509.34	509.39	± 0.18	kJ/mol	15.014680 ± 0.000099	13774-92-0*2
Hydrotrioxy	HOOO (g, cis)	64.8	59.9	± 1.1	kJ/mol	49.00614 ± 0.00090	12500-78-6*2
Oxonium	[H3O]+ (aq)		-285.825	± 0.027	kJ/mol	19.02267 ± 0.00037	13968-08-6*800
Hydroxymethylene cation	[HCOH]+ (g)	972.2	968.6	± 1.6	kJ/mol	30.02543 ± 0.00087	135395-06-1*0
Diazene	HNNH (g, trans-cis-iso equilib)	207.36	200.22	± 0.56	kJ/mol	30.02936 ± 0.00020	3618-05-1*0
Isocyanogen anion	[CNCN]- (g, trans-cis equilib)	383.9	388.0	± 2.5	kJ/mol	52.0354 ± 0.0016	83951-85-30
Fluorine atom	F (g, 2P1/2 only)	82.103	83.888	± 0.057	kJ/mol	18.99840320 ± 0.00000050	14762-94-8*2
Hydroxyaminylium	[HNOH]+ (g)	1020.2	1013.0	± 2.0	kJ/mol	32.02147 ± 0.00034	66097-71-0*0
Diazene cation	[HNNH]+ (g, trans-cis equilib)	1132.59	1125.69	± 0.74	kJ/mol	30.02881 ± 0.00020	76986-17-9*1
Methyl fluoride cation	[CH3F]+ (g)	980.71	973.20	± 0.66	kJ/mol	34.03237 ± 0.00083	59122-96-2*0
Methylene radical	CH2 (g)	390.95	391.46	± 0.14	kJ/mol	14.02658 ± 0.00081	2465-56-7*0
C=O-C cation	[COC]+ (g)	1575.9	1582.9	± 2.3	kJ/mol	40.0203 ± 0.0016	83483-98-1*0
Chlorine atom	Cl (g, 2P1/2 only)	130.177	131.783	± 0.002	kJ/mol	35.45270 ± 0.00090	22537-15-1*2
COC vdW	(CO)(C) (g)	589.0	597.7	± 1.8	kJ/mol	40.0208 ± 0.0016	12071-24-80
Cyanogen chloride cation	[ClCN]+ (g)	1325.81	1327.14	± 0.97	kJ/mol	61.4696 ± 0.0012	37612-72-9*0
Methyl fluoride	CH3F (l)		-246.85	± 0.50	kJ/mol	34.03292 ± 0.00083	593-53-3*590
Methyl chloride cation	[CH3Cl]+ (g)	1013.86	1006.41	± 0.41	kJ/mol	50.4867 ± 0.0012	12538-71-5*0
Methyl chloride	CH3Cl (l)	-106.48	-102.51	± 0.21	kJ/mol	50.4872 ± 0.0012	74-87-3*590
Methyl bromide cation	[CH3Br]+ (g)	996.13	981.21	± 0.19	kJ/mol	94.9380 ± 0.0013	12538-70-4*0
3-Chloro-3-methyl-3H-diazirine	(NNC)ClCH3 (g)	230.	218.	± 40.	kJ/mol	90.5114 ± 0.0019	4222-21-3
n-Hexane	C6H14 (g)	-130.07	-166.94	± 0.48	kJ/mol	86.1754 ± 0.0049	110-54-3*0
Dinitrogen tetraoxide	O2NNO2 (cr,l)	-37.96	-27.10	± 0.18	kJ/mol	92.0111 ± 0.0012	10544-72-6*500
Dichlorine cation	[Cl2]+ (g)	1107.90	1107.87	± 0.22	kJ/mol	70.9049 ± 0.0018	12595-90-3*0
Methyl iodide cation	[CH3I]+ (g)	944.78	935.38	± 0.18	kJ/mol	141.93844 ± 0.00083	12538-72-6*0
Dicarbon monoxide	CCO (g)	374.8	378.9	± 1.3	kJ/mol	40.0208 ± 0.0016	12071-23-7*0
Iodosyl ion	[IO]+ (g)	1066.1	1064.1	± 2.0	kJ/mol	142.90332 ± 0.00030	81182-81-2*0
Fluoroform	CF3H (l)		-704.31	± 0.57	kJ/mol	70.01385 ± 0.00080	75-46-7*590
Hydroxyformyl	HOCO (g, trans-cis equilib)	-181.39	-183.97	± 0.55	kJ/mol	45.0174 ± 0.0010	2564-86-5*0
Isocyanogen chloride	ClNC (g)	314.8	316.6	± 2.5	kJ/mol	61.4701 ± 0.0012	75754-69-7*0
Hydrazoic acid	HNNN (cr,l)		261.70	± 0.72	kJ/mol	43.02816 ± 0.00022	7782-79-8*500
Oxygen atom	O (g, triplet only)	246.844	249.229	± 0.002	kJ/mol	15.99940 ± 0.00030	17778-80-2*1
2-Cyclopropyn-1-ylidene	C(CC) (g)	905.0	911.9	± 2.0	kJ/mol	36.0321 ± 0.0024	102508-15-6*0
Diiodine cation	[I2]+ (g)	963.523	960.408	± 0.018	kJ/mol	253.808391 ± 0.000060	28712-14-3*0
Water	H2O (cr)	-286.297	-292.738	± 0.027	kJ/mol	18.01528 ± 0.00033	7732-18-5*510
Cyclohexane	C6H12 (g)	-82.52	-122.08	± 0.68	kJ/mol	84.1595 ± 0.0049	110-82-7
Hydroxymethylene anion	[HCOH]- (g)	148.2	145.4	± 1.8	kJ/mol	30.02653 ± 0.00087	207914-87-2*0
Heptane	C7H16 (g)	-145.47	-187.34	± 0.74	kJ/mol	100.2019 ± 0.0057	142-82-5*0
Iminomethyl	HCNH (g, trans-cis equilib)	276.2	272.6	± 1.4	kJ/mol	28.03332 ± 0.00082	15691-95-9*0
Octane	C8H18 (g)	-161.39	-208.22	± 0.79	kJ/mol	114.2285 ± 0.0065	111-65-9*0
Bromoform	CBr3H (l)		1.3	± 1.3	kJ/mol	252.7306 ± 0.0031	75-25-2*590
2,2,4-Trimethylpentane	(CH3)2CHCH2C(CH3)3 (g)	-171.3	-223.7	± 1.5	kJ/mol	114.2285 ± 0.0065	540-84-1*0
Diazene	HNNH (g, trans-cis equilib)	207.36	200.22	± 0.56	kJ/mol	30.02936 ± 0.00020	3618-05-1*1
Dinitrogen anion	[N2]- (g)	196.0	196.0	± 2.2	kJ/mol	28.01403 ± 0.00014	12185-02-3*0
Dioxymethylene	HCOO (g, cis-trans equilib)	332.1	329.9	± 5.9	kJ/mol	45.0174 ± 0.0010	438586-67-5*0
Nitrosyl nitrite	ONONO (g)	91.2	86.6	± 1.6	kJ/mol	76.01168 ± 0.00091	122413-35-8*0
Hydrogen difluoride cation	[FHF]+ (g)	1255.	1251.	± 20.	kJ/mol	39.004198 ± 0.000070	126950-54-7*0
Dihydrogen trioxide	HOOOH (g)	-82.13	-90.49	± 0.91	kJ/mol	50.01408 ± 0.00091	14699-99-1*0
Methylene fluoride	CH2F2 (l)		-467.31	± 0.48	kJ/mol	52.02339 ± 0.00081	75-10-5*590
2-Hydroxyethyl	CH2CH2OH (g)	-12.55	-25.82	± 0.61	kJ/mol	45.0605 ± 0.0017	4422-54-2*0
Cyanogen bromide cation	[BrCN]+ (g)	1330.3	1324.0	± 1.2	kJ/mol	105.9209 ± 0.0013	34749-77-4*0
Hydrogen peroxide cation	[H2O2]+ (g)	896.75	889.79	± 0.60	kJ/mol	34.01413 ± 0.00062	12325-10-9*0
Succinic acid	(CH2COOH)2 (g)	-795.62	-817.76	± 0.61	kJ/mol	118.0880 ± 0.0034	110-15-6*0
Formic acid cation	[HC(O)OH]+ (g, syn-anti equilib)	721.79	715.22	± 0.28	kJ/mol	46.0248 ± 0.0010	50614-05-6*0
Formic acid anion	[HC(O)OH]- (g, syn-anti equilib)	-254.5	-260.7	± 2.3	kJ/mol	46.0259 ± 0.0010	19066-82-1*0
Trihydrogen cation	[H3]+ (g, ortho)	1110.577	1106.695	± 0.013	kJ/mol	3.02327 ± 0.00021	28132-48-1*1
Hydroxyamidogen	HNOH (g)	101.54	94.71	± 1.00	kJ/mol	32.02202 ± 0.00034	13940-32-4*0
Cyanogen fluoride cation	[FCN]+ (g)	1293.8	1294.5	± 1.2	kJ/mol	45.01529 ± 0.00080	62532-69-8*0
Dihydrogen anion	[H2]- (g)	317.0	317.9	± 3.1	kJ/mol	2.01643 ± 0.00014	12184-89-3*0
Fluoro(fluorooxy)methylene	FCOF (g)	-135.5	-136.6	± 2.1	kJ/mol	66.00691 ± 0.00085	479587-30-9*0
Iminomethyl anion	[HCNH]- (g)	239.0	235.3	± 2.0	kJ/mol	28.03387 ± 0.00082	90623-30-6*0
Trioxodinitrate anion	[ONNO2]- (g)	-103.0	-106.9	± 2.9	kJ/mol	76.01223 ± 0.00091	194856-62-7*0
Hydrogen nitroxylate	[HONO]- (g)	-107.7	-111.2	± 2.0	kJ/mol	47.01403 ± 0.00061	24388-53-2*0
Isocyanogen bromide	BrNC (g)	344.2	338.5	± 3.7	kJ/mol	105.9214 ± 0.0013	65997-98-0*0
Diazene cation	[HNNH]+ (g, trans-iso-cis equilib)	1132.59	1125.92	± 0.74	kJ/mol	30.02881 ± 0.00020	76986-17-9*0
Ethylene anion	[C2H4]- (g)	236.8	230.3	± 2.3	kJ/mol	28.0537 ± 0.0016	34527-91-8*0
1,1-Dibromoethane	CHBr2CH3 (cr,l)		-66.3	± 1.4	kJ/mol	187.8612 ± 0.0026	557-91-5*500
Hydroxyformyl anion	[HOCO]- (g, trans-cis equilib)	-320.4	-322.4	± 1.2	kJ/mol	45.0180 ± 0.0010	78944-70-4*0
Ethylidyne	CH3C (g, doublet)	512.7	508.6	± 1.4	kJ/mol	27.0452 ± 0.0016	67624-57-1*1
Helium cation	He+ (g)	2372.322	2372.322	± 0.000	kJ/mol	4.0020534 ± 0.0000020	14234-48-1*0
Helium dication	[He]+2 (g)	7622.839	7622.839	± 0.000	kJ/mol	4.0015048 ± 0.0000020	12587-46-1*0
Neon cation	Ne+ (g)	2080.662	2080.769	± 0.001	kJ/mol	20.17915 ± 0.00060	14782-23-1*0
Argon cation	Ar+ (g)	1520.571	1520.580	± 0.001	kJ/mol	39.9475 ± 0.0010	14791-69-6*0
Krypton cation	Kr+ (g)	1350.759	1350.759	± 0.002	kJ/mol	83.7995 ± 0.1000	16915-28-9*0

References

1		B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner, Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited. J. Phys. Chem. A 108, 9979-9997 (2004) [DOI: 10.1021/jp047912y]
2		B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner, Active Thermochemical Tables: Thermochemistry for the 21^st Century. J. Phys. Conf. Ser. 16, 561-570 (2005) [DOI: 10.1088/1742-6596/16/1/078]
3		B. Ruscic, Active Thermochemical Tables (ATcT) values based on ver. 1.112 of the Thermochemical Network (2013); available at ATcT.anl.gov
4		E. Goos, A. Burcat, and B. Ruscic, Extended Third Millennium Thermodynamic Database for Combustion and Air-Pollution Use with Updates from Active Thermochemical Tables, maintained at Technion, Haifa and DLR, Stuttgart, and mirrored at E�tv�s University, Budapest; last printed edition of this database is: A. Burcat and B. Ruscic, Third Millennium Ideal Gas and Condensed Phase Thermochemical Database for Combustion with Updates from Active Thermochemical Tables Joint Report: ANL-05/20, Argonne National Laboratory, Argonne, IL, USA, and TAE 960, Technion � Israel Institute of Technology, Haifa, Israel (2005) [DOI: 10.2172/925269]

Formula

The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.

Uncertainties

The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry.
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.000₅ kJ/mol.

Acknowledgement

This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.