Lead monofluoride
- Formula: FPb
- Molecular weight: 226.2
- CAS Registry Number: 14986-72-2
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Gas phase thermochemistry data
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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 | -19.18 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1973 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 59.749 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1973 |
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) | 298. to 6000. |
|---|---|
| A | 8.799611 |
| B | 0.086789 |
| C | 0.126288 |
| D | -0.015386 |
| E | -0.053972 |
| F | -21.99250 |
| G | 70.06250 |
| H | -19.18410 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1973 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, NIST Free Links, 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:
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
View reactions leading to FPb+ (ion structure unspecified)
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 7.5 ± 0.3 | EI | Zmbov, Hastie, et al., 1968 | RDSH |
Constants of diatomic molecules
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Klaus P. Huber and Gerhard H. Herzberg
Data collected through July, 1977
| Symbol | Meaning |
|---|---|
| State | electronic state and / or symmetry symbol |
| Te | minimum electronic energy (cm-1) |
| ωe | vibrational constant – first term (cm-1) |
| ωexe | vibrational constant – second term (cm-1) |
| ωeye | vibrational constant – third term (cm-1) |
| Be | rotational constant in equilibrium position (cm-1) |
| αe | rotational constant – first term (cm-1) |
| γe | rotation-vibration interaction constant (cm-1) |
| De | centrifugal distortion constant (cm-1) |
| βe | rotational constant – first term, centrifugal force (cm-1) |
| re | internuclear distance (Å) |
| Trans. | observed transition(s) corresponding to electronic state |
| ν00 | position of 0-0 band (units noted in table) |
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Strong absorption continuum with maximum at ~41000 cm-1; emission continuum with maximum at ~32800 cm-1. | ||||||||||||
| ↳Rochester, 1936 | ||||||||||||
| F | (47866) | [628] H | F ← X1 (V) | 47927 H | ||||||||
| ↳Rochester, 1936 | ||||||||||||
| E | (45400) | (565) H | E → X2 V | |||||||||
| ↳Singh, 1967 | ||||||||||||
| E ← X1 V | 45430 H | |||||||||||
| ↳Rochester, 1936 | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| D | (43818) | [597] H | D ← X1 (V) | 43863 H | ||||||||
| ↳Rochester, 1936 | ||||||||||||
| C | 38046 | 594.0 H | 2.50 1 | C ← X1 V | 38089 H | |||||||
| ↳Rochester, 1936 | ||||||||||||
| B 2Σ+ | 35644.4 | [605.75] Z | 3.42 HQ | 0.24810 2 3 | 0.001479 | 1.63E-7 | 1.9756 | B ↔ X2 V | 27420.91 Z | |||
| ↳missing citation; missing citation; Lumley and Barrow, 1977 | ||||||||||||
| B ↔ X1 V | 35696.79 Z | |||||||||||
| ↳missing citation; Lumley and Barrow, 1977 | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| A 1/2 (2Σ+) | 22556.5 | [394.73] Z | 1.77 H | 0.20762 4 | 0.001430 | 2.22E-7 | 2.1597 | A → X2 R | 14226.21 | |||
| ↳Barrow, Butler, et al., 1959 | ||||||||||||
| A ↔ X1 R | 22502.09 Z | |||||||||||
| ↳Morgan, 1936; missing citation; Lumley and Barrow, 1977 | ||||||||||||
| X2 2Π3/2 | 8263.5 | [528.75] Z | 1.50 HQ | 0.23403 | 0.001450 | 1.78E-7 | 2.0342 | (X2-X1) | 8275.88 | |||
| X1 2Π1/2 | 0 | [502.73] Z | 2.28 5 | 0.22875 6 | 0.001473 | 1.83E-7 | 2.0575 | |||||
Notes
| 1 | Diffuse bands 9 |
| 2 | Spin splitting constant γ = +0.0027. |
| 3 | Breaking off in emission above v'=1 (predissociation). |
| 4 | Ω-type doubling Δνfe(v=0) = +0.6185(J+1/2) -10.2E-7(J+1/2)3. |
| 5 | Determined from head-origin calculations. |
| 6 | Λ-type doubling Δνfe(v=0)= -0.1388(J+1/2). |
| 7 | Thermochemica1 value (mass-spectrometry) Zmbov, Hastie, et al., 1968. See also Wieland and Newburgh, 1952 who consider the possibilities D00 = 4.54, 3.57, or 3.22 eV. |
| 8 | Electron impact appearance potential Zmbov, Hastie, et al., 1968. |
| 9 | Wieland and Newburgh, 1952 consider it possible that the observed C state levels (v=1... 5) are actually higher vibrational levels of B 2Σ+ (v=5...9). |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, NIST Free Links, 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]
Zmbov, Hastie, et al., 1968
Zmbov, K.F.; Hastie, J.W.; Margrave, J.L.,
Mass spectrometric studies at high temperatures. Part 24. Thermodynamics of vaporization of SnF, and PbF, and the dissociation energies of SnF and PbF,
J. Chem. Soc. Faraday Trans., 1968, 64, 861. [all data]
Rochester, 1936
Rochester, G.D.,
The band spectra of the lead halides, PbF and PbCl,
Proc. R. Soc. London A, 1936, 153, 407. [all data]
Singh, 1967
Singh, S.P.,
Emission spectrum of PbF molecule,
Indian J. Pure Appl. Phys., 1967, 5, 292. [all data]
Lumley and Barrow, 1977
Lumley, D.J.W.; Barrow, R.F.,
Rotational analysis of the B-X2, B-X1 and A-X1 systems of gaseous PbF,
J. Phys. B:, 1977, 10, 1537. [all data]
Barrow, Butler, et al., 1959
Barrow, R.F.; Butler, D.; Johns, J.W.C.; Powell, J.L.,
Some observations on the spectra of the diatomic fluorides of silicon, germanium, tin, and lead,
Proc. Phys. Soc. London, 1959, 73, 317. [all data]
Morgan, 1936
Morgan, F.,
Absorption spectra of PbF, PbCl and PbBr,
Phys. Rev., 1936, 49, 47. [all data]
Wieland and Newburgh, 1952
Wieland, K.; Newburgh, R.,
Uber einige neue Bandenspektren der Radikale PbCl, PbBr und PbJ,
Helv. Phys. Acta, 1952, 25, 87. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, NIST Free Links, References
- Symbols used in this document:
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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