Aluminum monobromide

Formula: AlBr
Molecular weight: 106.886
CAS Registry Number: 22359-97-3
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Other data available:
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Constants of diatomic molecules

Data compiled by: Klaus P. Huber and Gerhard H. Herzberg

Data collected through November, 1975

Symbols used in the table of constants
Symbol	Meaning
State	electronic state and / or symmetry symbol
T_e	minimum electronic energy (cm^-1)
ω_e	vibrational constant – first term (cm^-1)
ω_ex_e	vibrational constant – second term (cm^-1)
ω_ey_e	vibrational constant – third term (cm^-1)
B_e	rotational constant in equilibrium position (cm^-1)
α_e	rotational constant – first term (cm^-1)
γ_e	rotation-vibration interaction constant (cm^-1)
D_e	centrifugal distortion constant (cm^-1)
β_e	rotational constant – first term, centrifugal force (cm^-1)
r_e	internuclear distance (Å)
Trans.	observed transition(s) corresponding to electronic state
ν₀₀	position of 0-0 band (units noted in table)

Diatomic constants for ²⁷Al⁷⁹Br
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
A ¹Π	35879.5	297.2 H^Q	6.40 1	-0.527	0.1555 2	0.00216 3	-0.000175	0.00000018 4		2.322	A ↔ X R	35837.8 H^Q
A ¹Π	↳Crawford and Ffolliott, 1933; missing citation; Mahanti, 1935; missing citation; Jennergren, 1948
a ³Π₁	23779.3	410.32 H^Q	1.75		0.164 5	0.001				2.26	a → X V	23795.3 H^Q
a ³Π₁	↳Miescher, 1935; missing citation
a ³Π₀	23647	411.2 (Z)	1.75								a → X V	(23663) 6 (Z)
X ¹Σ⁺	0	378.0 H^Q	1.28		0.15919713	0.00086044₉	2.030E-06	1.1285E-07 7	-2.0₇E-10	2.294807 8

Notes

This state may have a potential hump of ~ 0.20 eV Barrow, 1960, Barrow, 1961.

Predissociation for v > 3 According to Ram, Upadhya, et al., 1973 emission from v=2,3 breaks off at J=93,67, respectively.

missing note

Rapidly increasing with v.

Estimated from P and Q head separations.

P head at 23657.9 cm^-1.

H_e = -1.119E-14.

From the corrected B_e = 0.15920431.

Thermochemical value Barrow, 1961; 4.58 eV from predissociation in A ¹Π.

For values of eqQ see Hoeft, Torring, et al., 1973.

References

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Crawford and Ffolliott, 1933
Crawford, F.H.; Ffolliott, C.F., The band spectra of the halides of aluminum, Phys. Rev., 1933, 44, 953. [all data]

Mahanti, 1935
Mahanti, P.C., The band spectrum of aluminum bromide, Indian J. Phys., 1935, 9, 369. [all data]

Jennergren, 1948
Jennergren, C.G., Band spectrum of aluminum bromide (AlBr), Ark. Mat. Astron. Fys., 1948, 35, 22, 1. [all data]

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

Barrow, 1961
Barrow, R.F., Triplet bands of carbon monoxide: the system e³Σ - a³Π, Nature (London), 1961, 189, 480. [all data]

Ram, Upadhya, et al., 1973
Ram, R.S.; Upadhya, K.N.; Rai, D.K.; Singh, J., Rotational analysis of the A¹Π-X¹Σ system of aluminum monobromide. Determination of dissociation energy by predissociation, Opt. Pura Apl., 1973, 6, 38. [all data]

Hoeft, Torring, et al., 1973
Hoeft, J.; Torring, T.; Tiemann, E., Hyperfeinstruktur von AlCl und AlBr, Z. Naturforsch. A, 1973, 28, 1066. [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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