Selected ATcT [1, 2] enthalpy of formation based on version 1.172 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.156 to include species relevant to a study of photodissociation of formamide[4].

Trihydrogen cation

Formula: [H3]+ (g)

CAS RN: 28132-48-1

ATcT ID: 28132-48-1*0

SMILES: [H]1[H+][H]1

InChI: InChI=1S/H3/c1-2-3-1/q+1

InChIKey: RQZCXKHVAUFVMF-UHFFFAOYSA-N

SMILES: [H][H+][H]

InChI: InChI=1S/H3/h1H2/q+1

InChIKey: QWLPJNYQVKBMAN-UHFFFAOYSA-N

Hills Formula: H3+

2D Image:

Aliases: [H3]+; Trihydrogen cation; Trihydrogen ion (1+); Triatomic hydrogen cation; Triatomic hydrogen ion (1+)

Relative Molecular Mass: 3.02327 ± 0.00021

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
1110.304	1106.696	± 0.013	kJ/mol

3D Image of [H3]+ (g)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of [H3]+ (g)

The 2 contributors listed below account for 99.2% of the provenance of Δ_fH° of [H3]+ (g).

Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.

Contribution (%)	TN ID	Reaction	Measured Quantity	Reference
49.6	98.6	[H3]+ (g) → 3 H+ (g)	Δ_rH°(0 K) = 290399.69 ± 1.5 cm-1	Cencek 1998, Jaquet 1998, note H3+, Lindsay 2001, Rohse 1993
49.6	98.7	[H3]+ (g) → 3 H+ (g)	Δ_rH°(0 K) = 290398.83 ± 1.5 cm-1	Cencek 1998, Matyus 2007, Lindsay 2001, Rohse 1993

Top 10 species with enthalpies of formation correlated to the Δ_fH° of [H3]+ (g)

Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances.
The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.

Correlation Coefficent (%)	Species Name	Formula	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
100.0	Trihydrogen cation	[H3]+ (g, para)	1110.304	1106.697	± 0.013	kJ/mol	3.02327 ± 0.00021	28132-48-1*2
100.0	Trihydrogen cation	[H3]+ (g, ortho)	1110.577	1106.695	± 0.013	kJ/mol	3.02327 ± 0.00021	28132-48-1*1
90.9	Trihydrogen	H(HH) (g, 2p 2A2" Ry)	756.931	754.146	± 0.015	kJ/mol	3.02382 ± 0.00021	12184-91-7*2
20.5	Trihydrogen	H(HH) (g, 2s 2A1' Ry)	745.878	743.094	± 0.062	kJ/mol	3.02382 ± 0.00021	12184-91-7*1
20.5	Trihydrogen	H(HH) (g, Ry)	745.878	743.199	± 0.062	kJ/mol	3.02382 ± 0.00021	12184-91-7*0
11.7	Dioxidenium	[HOO]+ (g)	1110.87	1107.98	± 0.11	kJ/mol	33.00619 ± 0.00060	12207-52-2*0
1.7	Kryptonium	[KrH]+ (g)	1106.29	1104.50	± 0.68	kJ/mol	84.8074 ± 0.1000	37276-90-7*0

Most Influential reactions involving [H3]+ (g)

Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.

Influence Coefficient	TN ID	Reaction	Measured Quantity	Reference
1.000	101.1	[H3]+ (g, para) → [H3]+ (g)	Δ_rH°(0 K) = 0. ± 0. cm-1	Lindsay 2001
0.932	93.1	H(HH) (g, 2p 2A2" Ry) → [H3]+ (g)	Δ_rH°(0 K) = 29539.74 ± 0.5 cm-1	Helm 1988, Lembo 1990
0.596	297.10	[H3]+ (g) + O2 (g) → [HOO]+ (g) + H2 (g)	Δ_rG°(80 K) = 0.57 ± 0.13 kJ/mol	Adams 1984, 3rd Law, note unc
0.575	9324.2	[KrH]+ (g) + H2 (g) → [H3]+ (g) + Kr (g)	Δ_rG°(296 K) = 6.97 ± 0.89 kJ/mol	Payzant 1975, 3rd Law, note unc
0.496	98.7	[H3]+ (g) → 3 H+ (g)	Δ_rH°(0 K) = 290398.83 ± 1.5 cm-1	Cencek 1998, Matyus 2007, Lindsay 2001, Rohse 1993
0.496	98.6	[H3]+ (g) → 3 H+ (g)	Δ_rH°(0 K) = 290399.69 ± 1.5 cm-1	Cencek 1998, Jaquet 1998, note H3+, Lindsay 2001, Rohse 1993
0.202	88.1	(H)(HH) (g, vdW) → [H3]+ (g)	Δ_rH°(0 K) = 74759 ± 200 cm-1	Pavanello 2009b, Matyus 2007, est unc
0.194	9324.1	[KrH]+ (g) + H2 (g) → [H3]+ (g) + Kr (g)	Δ_rG°(296 K) = 8.28 ± 1.53 kJ/mol	Bohme 1980, 3rd Law, note unc
0.159	297.11	[H3]+ (g) + O2 (g) → [HOO]+ (g) + H2 (g)	Δ_rH°(150 K) = 0.33 ± 0.06 kcal/mol	Adams 1984, 2nd Law, note unc
0.114	265.8	[H2OOH]+ (g, trans) + H2 (g) → HOOH (g) + [H3]+ (g)	Δ_rH°(0 K) = 58.18 ± 0.8 kcal/mol	Ruscic W1RO
0.077	88.6	(H)(HH) (g, vdW) → [H3]+ (g)	Δ_rH°(0 K) = 9.261 ± 0.040 eV	Ruscic W1RO
0.077	297.12	[H3]+ (g) + O2 (g) → [HOO]+ (g) + H2 (g)	Δ_rH°(83 K) = 0.94 ± 0.25 (×1.445) kJ/mol	Kluge 2012, est unc
0.073	265.4	[H2OOH]+ (g, trans) + H2 (g) → HOOH (g) + [H3]+ (g)	Δ_rH°(0 K) = 58.82 ± 1.0 kcal/mol	Ruscic G4
0.073	265.7	[H2OOH]+ (g, trans) + H2 (g) → HOOH (g) + [H3]+ (g)	Δ_rH°(0 K) = 58.16 ± 1.0 kcal/mol	Ruscic CBS-n
0.073	585.5	[HFH]+ (g, singlet) + H2 (g) → HF (g) + [H3]+ (g)	Δ_rH°(0 K) = 15.46 ± 0.8 kcal/mol	Ruscic W1RO, Ruscic W1U
0.058	93.2	H(HH) (g, 2p 2A2" Ry) → [H3]+ (g)	Δ_rH°(0 K) = 29538 ± 2 cm-1	Dodhy 1988, est unc
0.050	265.3	[H2OOH]+ (g, trans) + H2 (g) → HOOH (g) + [H3]+ (g)	Δ_rH°(0 K) = 58.33 ± 1.2 kcal/mol	Ruscic G3X
0.046	585.2	[HFH]+ (g, singlet) + H2 (g) → HF (g) + [H3]+ (g)	Δ_rH°(0 K) = 15.95 ± 1.0 kcal/mol	Ruscic G4
0.046	585.4	[HFH]+ (g, singlet) + H2 (g) → HF (g) + [H3]+ (g)	Δ_rH°(0 K) = 15.47 ± 1.0 kcal/mol	Ruscic CBS-n
0.043	265.6	[H2OOH]+ (g, trans) + H2 (g) → HOOH (g) + [H3]+ (g)	Δ_rH°(0 K) = 57.48 ± 1.3 kcal/mol	Ruscic CBS-n

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 and D. H. Bross, Active Thermochemical Tables (ATcT) values based on ver. 1.172 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		K. L. Caster, N. A. Seifert, B. Ruscic, A. W. Jasper, and K. Prozument, Dynamics of HCN, NHC, and HNCO Formation in the 193 nm Photodissociation of Formamide J. Phys. Chem. A (in press) (2024) [DOI: 10.1021/acs.jpca.4c02232]
5		B. Ruscic, Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables. Int. J. Quantum Chem. 114, 1097-1101 (2014) [DOI: 10.1002/qua.24605]
6		B. Ruscic and D. H. Bross, Thermochemistry Computer Aided Chem. Eng. 45, 3-114 (2019) [DOI: 10.1016/B978-0-444-64087-1.00001-2]

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 (see, for example, Ruscic [5] and Ruscic and Bross[6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.000₅ kJ/mol.

Website Functionality Credits

The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/.

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.