beryllium fluoride
- Formula: BeF2
- Molecular weight: 47.008988
- CAS Registry Number: 7787-49-7
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Gas phase thermochemistry data
Go To: Top, Gas phase ion energetics data, Vibrational and/or electronic energy levels, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | -190.25 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1970 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 54.388 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1970 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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Temperature (K) | 2000. to 6000. |
---|---|
A | 14.70150 |
B | 0.112325 |
C | -0.022603 |
D | 0.001558 |
E | -0.771553 |
F | -196.6370 |
G | 69.29670 |
H | -190.2500 |
Reference | Chase, 1998 |
Comment | Data last reviewed in June, 1970 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Vibrational and/or electronic energy levels, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
14.5 ± 1.0 | EI | Farber and Srivastava, 1974 | LLK |
14.7 ± 0.4 | EI | Hildenbrand and Murad, 1966 | RDSH |
14.5 ± 0.4 | EI | Hildenbrand and Theard, 1965 | RDSH |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
Be+ | 28.3 ± 1.0 | ? | EI | Hildenbrand and Theard, 1965 | RDSH |
BeF+ | 15.5 | F | EI | Hildenbrand and Murad, 1966 | RDSH |
BeF+ | 15.4 ± 0.4 | F | EI | Hildenbrand and Theard, 1965 | RDSH |
Vibrational and/or electronic energy levels
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Marilyn E. Jacox
State: X
Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
---|---|---|---|---|---|---|---|
Σg+ | 1 | Sym. stretch | 769.09 | gas | IR | Yu, Shayesteh, et al., 2005 | |
Πu | 2 | Bend | 342.61 | gas | IR | Yu, Shayesteh, et al., 2005 | |
2 | Bend | 330 | s | Ne | IR | Snelson, 1966 | |
2 | Bend | 309 | s | Ar | IR | Snelson, 1966 | |
2 | Bend | 302 | s | Kr | IR | Snelson, 1966 | |
Σu+ | 3 | Asym. stretch | 1555.05 | gas | IR | Frum, Engleman, et al., 1991 Yu, Shayesteh, et al., 2005 | |
3 | Asym. stretch | 1542 | vs | Ne | IR | Snelson, 1966 | |
3 | Asym. stretch | 1528 | vs | Ar | IR | Snelson, 1966 | |
3 | Asym. stretch | 1524 | vs | Kr | IR | Snelson, 1966 | |
Additional references: Jacox, 1994, page 83; Buchler, Stauffer, et al., 1964
Notes
s | Strong |
vs | Very strong |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Farber and Srivastava, 1974
Farber, M.; Srivastava, R.D.,
Dissociation energies of BeF and BeCl and the heat of formation of BeClF,
J. Chem. Soc. Faraday Trans. 1, 1974, 70, 1581. [all data]
Hildenbrand and Murad, 1966
Hildenbrand, D.L.; Murad, E.,
Mass-spectrometric determination of the dissociation energy of beryllium monofluoride,
J. Chem. Phys., 1966, 44, 1524. [all data]
Hildenbrand and Theard, 1965
Hildenbrand, D.L.; Theard, L.P.,
Effusion studies, mass spectra, and thermodynamics of beryllium fluoride vapor,
J. Chem. Phys., 1965, 42, 3230. [all data]
Yu, Shayesteh, et al., 2005
Yu, S.; Shayesteh, A.; Bernath, P.F.; Koput, J.,
The vibration-rotation emission spectrum of hot BeF[sub 2],
J. Chem. Phys., 2005, 123, 13, 134303, https://doi.org/10.1063/1.2039085
. [all data]
Snelson, 1966
Snelson, A.,
Infrared Spectra of Some Alkaline Earth Halides by the Matrix Isolation Technique,
J. Phys. Chem., 1966, 70, 10, 3208, https://doi.org/10.1021/j100882a031
. [all data]
Frum, Engleman, et al., 1991
Frum, C.I.; Engleman, R., Jr.; Bernath, P.F.,
Fourier transform emission spectroscopy of BeF2 at 6.5 μm,
J. Chem. Phys., 1991, 95, 3, 1435, https://doi.org/10.1063/1.461056
. [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]
Buchler, Stauffer, et al., 1964
Buchler, A.; Stauffer, J.L.; Klemperer, W.,
None,
J. Am. Chem. Soc., 1964, 86, 21, 4544, https://doi.org/10.1021/ja01075a007
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, References
- Symbols used in this document:
AE Appearance energy S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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