Selected ATcT [1, 2] enthalpy of formation based on version 1.202 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.176 in order to include species related to the thermochemistry of glycine[4].

Helium anion

Formula: He- (g, 1s.2s.2p 4P)

CAS RN: 14452-58-5

ATcT ID: 14452-58-5*3

SMILES: [He-]

InChI: InChI=1S/He/q-1

InChIKey: GQCTUJCUOFABIY-UHFFFAOYSA-N

Hills Formula: He1-

2D Image:

Aliases: He-; Helium anion; Helium ion (1-); Helium atom anion; Helium atom ion (1-); Atomic helium anion; Atomic helium ion (1-)

Relative Molecular Mass: 4.0031506 ± 0.0000020

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
1904.822	1904.822	± 0.000	kJ/mol

3D Image of He- (g, 1s.2s.2p 4P)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of He- (g, 1s.2s.2p 4P)

The 3 contributors listed below account for 93.0% of the provenance of Δ_fH° of He- (g, 1s.2s.2p 4P).

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
58.4	9488.1	He- (g, 1s.2s.2p 4P) → He (g, triplet)	Δ_rH°(0 K) = 0.07752848 ± 0.00000018 eV	Wang 2014, note unc
27.7	9480.1	He (g, singlet) → He (g)	Δ_rH°(0 K) = 0 ± 0 cm-1	triv, NIST Atomic Web
6.9	9481.1	He (g, singlet) → He (g, triplet)	Δ_rH°(0 K) = 159855.9743297 ± 0.0000020 cm-1	NIST Atomic Web, Morton 2006

Top 10 species with enthalpies of formation correlated to the Δ_fH° of He- (g, 1s.2s.2p 4P)

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	Image	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
64.4	Helium	He (g, triplet)		1912.302	1912.302	± 0.000	kJ/mol	4.0026020 ± 0.0000020	7440-59-7*1
52.6	Helium	He (g, singlet)		-0.000	-0.000	± 0.000	kJ/mol	4.0026020 ± 0.0000020	7440-59-7*2

Most Influential reactions involving He- (g, 1s.2s.2p 4P)

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
0.999	9488.1	He- (g, 1s.2s.2p 4P) → He (g, triplet)	Δ_rH°(0 K) = 0.07752848 ± 0.00000018 eV	Wang 2014, note unc
0.432	9490.1	He- (g, 1s.2s.2p 4P) → He- (g, 2p3 4S3/2)	Δ_rH°(0 K) = 39.59308 ± 0.005 eV	Salas 2014, est unc
0.432	9490.2	He- (g, 1s.2s.2p 4P) → He- (g, 2p3 4S3/2)	Δ_rH°(0 K) = 39.59307 ± 0.005 eV	Turbiner 2013, Bylicki 1996, Salas 2014, est unc
0.000	9488.3	He- (g, 1s.2s.2p 4P) → He (g, triplet)	Δ_rH°(0 K) = 0.077516 ± 0.000012 (×1.044) eV	Kristensen 1997a, note unc
0.000	9488.2	He- (g, 1s.2s.2p 4P) → He (g, triplet)	Δ_rH°(0 K) = 0.077518 ± 0.000022 eV	Kristensen 1997a, note unc
0.000	9488.4	He- (g, 1s.2s.2p 4P) → He (g, triplet)	Δ_rH°(0 K) = 0.07767 ± 0.00012 (×1.189) eV	Walter 1994
0.000	9488.5	He- (g, 1s.2s.2p 4P) → He (g, triplet)	Δ_rH°(0 K) = 0.0775 ± 0.0008 eV	Peterson 1985
0.000	9488.7	He- (g, 1s.2s.2p 4P) → He (g, triplet)	Δ_rH°(0 K) = 0.07751 ± 0.0008 eV	Bunge 1984, Turbiner 2013, Bylicki 1996, note unc
0.000	9488.6	He- (g, 1s.2s.2p 4P) → He (g, triplet)	Δ_rH°(0 K) = 0.0774 ± 0.003 eV	Bunge 1979

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. 1.202 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		B. Ruscic and D. H. Bross Accurate and Reliable Thermochemistry by Data Analysis of Complex Thermochemical Networks using Active Thermochemical Tables: The Case of Glycine Thermochemistry Faraday Discuss. (in press) (2024) [DOI: 10.1039/D4FD00110A]
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.