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Boron monobromide


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
Deltafgas234.30kJ/molReviewChase, 1998Data last reviewed in December, 1964
Quantity Value Units Method Reference Comment
gas,1 bar224.96J/mol*KReviewChase, 1998Data last reviewed in December, 1964

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 (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. - 6000.
A 36.37666
B 1.272678
C -0.236082
D 0.020072
E -0.364850
F 222.1813
G 266.5631
H 234.3044
ReferenceChase, 1998
Comment Data last reviewed in December, 1964

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, 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: Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to BBr+ (ion structure unspecified)

Ionization energy determinations

IE (eV) Method Reference
10.7 ± 0.2EIKoski, Kaufman, et al., 1959

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 March, 1976

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 11B79Br
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
A 1Pi 33935.3 637.63 HQ 17.58 1 2 1.10 [0.496] 3 (0.009)  [0.00000128]  1.87 A lrarrow X 4 VR 33908.6 HQ
missing citation; missing citation; Wentink and Spindler, 1970
a 3Pi2 
a 3Pi1 18851.48 757.10 HQ 4.81 -0.004 0.5083 3 0.0036  [9.3E-07]  1.853 a rarrow X V 18887.55 Z
missing citation; missing citation
a 3Pi0+ 18673.83 759.80 4.80  0.5062 3 0.0036     a rarrow X 18711.25 Z
missing citation; missing citation
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
X 1Sigma+ 0 684.31 HQ 3.52  0.4894 3 0.0035  1.0E-06  1.8882  

Notes

1omegaeze = -0.250. This state may have a potential hump of ~0.13 eV; see Barrow, 1960.
2Predissociation above v = 4 Miescher, 1935.
3The rotational constants refer to the normal 79,81Br isotopic mixture.
4Radiative lifetime tau(v=0,1)= 26 ns Lutz and Hesser, 1968, corresponding to an absorption value of f00= 0.10.
5From the predissociation in A 1Pi; see Barrow, 1960.

References

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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]

Koski, Kaufman, et al., 1959
Koski, W.S.; Kaufman, J.J.; Pachucki, C.F., A mass spectroscopic appearance potential study of some boron trihalides, J. Am. Chem. Soc., 1959, 81, 1326. [all data]

Wentink and Spindler, 1970
Wentink, T., Jr.; Spindler, R.J., Jr., Franck-Condon Factors and r-centroids for No+, CP, SiF, BF, BCl, and BBr, J. Quant. Spectrosc. Radiat. Transfer, 1970, 10, 609. [all data]

Barrow, 1960
Barrow, R.F., Dissociation energies of the gaseous monohalides of boron, aluminium, gallium, indium, and thallium, Trans. Faraday Soc., 1960, 56, 952. [all data]

Miescher, 1935
Miescher, E., Bandenspektren von bor- und aluminium-halogeniden, Helv. Phys. Acta, 1935, 8, 279. [all data]

Lutz and Hesser, 1968
Lutz, B.L.; Hesser, J.E., Radiative lifetimes of BBr and of ultraviolet emissions in electron-beam excited BBr3 gas, J. Chem. Phys., 1968, 48, 3042. [all data]


Notes

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