Lead bromide

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°gas16.95kcal/molReviewChase, 1998Data last reviewed in December, 1973
Quantity Value Units Method Reference Comment
S°gas,1 bar65.131cal/mol*KReviewChase, 1998Data 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 8.908339
B 0.011886
C 0.155629
D -0.017625
E -0.007209
F 14.26990
G 75.86131
H 16.95100
ReferenceChase, 1998
Comment Data last reviewed in December, 1973

Constants of diatomic molecules

Go To: Top, Gas phase thermochemistry 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: Klaus P. Huber and Gerhard H. Herzberg

Data collected through July, 1977

Symbols used in the table of constants
SymbolMeaning
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)
Diatomic constants for (208)Pb79Br
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
B (2Σ) 34523.7 258.2 H 0.60 1        B ← X1 V 34549.0 H
↳missing citation
A (1/2) 20884.3 152.5 H 0.40 -0.028 2      A ↔ X1 R 20856.8 H
↳Morgan, 1936; Pannetier and Deschamps, 1965; Singh, 1968
X1 2Π1/2 0 207.5 H 0.50 -0.07 2       

Notes

1Diffuse bands (Prediss.)
2Tentative rotational analysis Lal and Khanna, 1968.
3See Wieland and Newburgh, 1952 for a discussion of this value.
4Electron impact study of PbBr2 Hastie, Bloom, et al., 1967; the same authors give 0.9 eV for the electron affinity of PbBr.
5ωexe = 0.52 Pannetier and Deschamps, 1965, ωeye = +0.0023 Pannetier and Deschamps, 1965. Similar constants in Singh, 1968.

References

Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, 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]

Morgan, 1936
Morgan, F., Absorption spectra of PbF, PbCl and PbBr, Phys. Rev., 1936, 49, 47. [all data]

Pannetier and Deschamps, 1965
Pannetier, G.; Deschamps, P., Le spectre du monobromure de plomb en emission, C.R. Acad. Sci. Paris, 1965, 261, 3109. [all data]

Singh, 1968
Singh, S.P., Emission spectrum of PbBr molecule, Indian J. Pure Appl. Phys., 1968, 6, 384. [all data]

Lal and Khanna, 1968
Lal, K.M.; Khanna, B.N., A note on the rotational analysis of the A-X system of the PbBr molecule, Can. J. Phys., 1968, 46, 1991. [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]

Hastie, Bloom, et al., 1967
Hastie, J.W.; Bloom, H.; Morrison, J.D., Electronimpact studies of PbCl2, PbBr2, and PbClBr, J. Chem. Phys., 1967, 47, 1580. [all data]

Notes

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