FHF-

Formula: F₂H^-
Molecular weight: 39.00529
CAS Registry Number: 18130-74-0
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Vibrational and/or electronic energy levels

State: X

Vib. sym.	No.	Approximate type of mode	cm^-1		Med.	Method	References


Σ_g⁺	1	Sym. stretch	583.05		gas	DL	Kawaguchi and Hirota, 1987
Π_u	2	Bend	1286.03		gas	DL	Kawaguchi and Hirota, 1987
	2	Bend	1217	m Cs	Ar	IR	Ault, 1978 Ault, 1979
Σ_u⁺	3	Asym. stretch	1331.15		gas	DL	Kawaguchi and Hirota, 1987
	3	Asym. stretch	1379		Ne	IR	Hunt and Andrews, 1987
	3	Asym. stretch	1377.0	s	Ar	IR	McDonald and Andrews, 1979 Hunt and Andrews, 1987
	3	Asym. stretch	1364	vs Cs	Ar	IR	Ault, 1978 Ault, 1979

Additional references: Jacox, 1994, page 53; Jacox, 1998, page 156; Kawaguchi and Hirota, 1995

Notes

Medium

Strong

Very strong

Interaction with cesium

References

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Kawaguchi and Hirota, 1987
Kawaguchi, K.; Hirota, E., Diode laser spectroscopy of the ν3 and ν2 bands of FHF- in 1300 cm-1 region, J. Chem. Phys., 1987, 87, 12, 6838, https://doi.org/10.1063/1.453378 . [all data]

Ault, 1978
Ault, B.S., Infrared spectra and structure of the argon-matrix isolated hydrogen difluoride(1-) anion, J. Phys. Chem., 1978, 82, 7, 844, https://doi.org/10.1021/j100496a018 . [all data]

Ault, 1979
Ault, B.S., Infrared matrix isolation studies of the M+HF2- and M+XHF- ion pairs, for X = chlorine, bromine, and iodine, J. Phys. Chem., 1979, 83, 7, 837, https://doi.org/10.1021/j100470a015 . [all data]

Hunt and Andrews, 1987
Hunt, R.D.; Andrews, L., FTIR spectra of the HF-2 and H2F-3 anions isolated in solid argon and neon, J. Chem. Phys., 1987, 87, 12, 6819, https://doi.org/10.1063/1.453376 . [all data]

McDonald and Andrews, 1979
McDonald, S.A.; Andrews, L., Infrared spectrum and structure of the isolated HF2- ion in solid argon, J. Chem. Phys., 1979, 70, 6, 3134, https://doi.org/10.1063/1.437805 . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Jacox, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [all data]

Kawaguchi and Hirota, 1995
Kawaguchi, K.; Hirota, E., Infrared diode laser spectroscopy of FDF-, J. Mol. Struct., 1995, 352/353, 389, https://doi.org/10.1016/0022-2860(95)08838-M . [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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