Arsenic dimer

Formula: As₂
Molecular weight: 149.84320
CAS Registry Number: 23878-46-8
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Other data available:
- Constants of diatomic molecules
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Gas phase ion energetics data

Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

View reactions leading to As₂⁺ (ion structure unspecified)

Electron affinity determinations

EA (eV)	Method	Reference	Comment
0.7390 ± 0.0080	LPES	Lippa, Xu, et al., 1998	B
<0.799982	PD	Feldman, Rackwitz, et al., 1977	Value probably near 0; B
0.1 ± 0.20	R-A	Bennett, Margrave, et al., 1973	From As₄; B

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.0 ± 0.2	EI	Hirayama, Straw, et al., 1985	LBLHLM
10.0	EI	Lau, Brittain, et al., 1982	LBLHLM
10.1 ± 0.2	S	Donovan and Strachan, 1971	LLK
10.4 ± 0.4	EI	DeMaria, Malaspina, et al., 1970	RDSH
11.0 ± 0.5	EI	Gutbier, 1961	RDSH

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
As⁺	13.9 ± 0.3	As	EI	Hirayama, Straw, et al., 1985	LBLHLM
As⁺	13.9 ± 0.4	As	EI	DeMaria, Malaspina, et al., 1970	RDSH

References

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Lippa, Xu, et al., 1998
Lippa, T.P.; Xu, S.J.; Lyapustina, S.A.; Nilles, J.M.; Bowen, K.H., Photoelectron spectroscopy of As-, As-2(-), As-3(-), As-4(-), and As-5(-), J. Chem. Phys., 1998, 109, 24, 10727-10731, https://doi.org/10.1063/1.477771 . [all data]

Feldman, Rackwitz, et al., 1977
Feldman, D.; Rackwitz, R.; Kaiser, H.J.; Heincke, E., Photodetachment bei einigen neagtiven molekulionen: P₂-, As₂-, CH₂-, CH₃-, S₃-, Z. Naturforsch. A:, 1977, 32, 600. [all data]

Bennett, Margrave, et al., 1973
Bennett, S.L.; Margrave, J.L.; Franklin, J.L.; Hudson, J.E., High temperature negative ions: Electron impact of As₄ vapor, J. Chem. Phys., 1973, 59, 5814. [all data]

Hirayama, Straw, et al., 1985
Hirayama, C.; Straw, R.D.; Hobgood, H.M., Equilibria over gas in the Knudsen cell range, J. Less-Common Met., 1985, 109, 331. [all data]

Lau, Brittain, et al., 1982
Lau, K.H.; Brittain, R.D.; Hildenbrand, D.L., Vaporization of As₂S₃ and the dissociation energy of AsS, J. Phys. Chem., 1982, 86, 4429. [all data]

Donovan and Strachan, 1971
Donovan, R.J.; Strachan, P., Vacuum U.-V. spectra of transient molecules and radicals, J. Chem. Soc. Faraday Trans., 1971, 67, 3407. [all data]

DeMaria, Malaspina, et al., 1970
DeMaria, G.; Malaspina, L.; Piacente, V., Mass spectrometric study of the GaAs system, J. Chem. Phys., 1970, 52, 1019. [all data]

Gutbier, 1961
Gutbier, H., Massenspektrometrische Untersuchungen der Verdampfungsvorgange bei einigen Verbindungen mit Zinkblende-Gitter im Temperaturbereich um 1000 degree K, Z. Naturforsch. A:, 1961, 16, 268. [all data]

Notes

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Symbols used in this document:

AE Appearance energy

EA Electron affinity
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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