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beryllium sulphide

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 April, 1976

Symbols used in the table of constants
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 9Be32S
b (3Pi)           (b larrow a) R 25961.8 H
missing citation
           (b larrow a) R 25941.8 H
missing citation
           (b larrow a) R 25924.5 H
missing citation
B lSigma+ 25941.6 1 851.35 Z 4.85  0.72894 0.00604 -0.00003 0.00000214  1.81368 B lrarrow X R 25868.61 Z
Gissane and Barrow, 1963; missing citation
C (1Delta) 13545.8 [660.7] 1 5.5  [0.5963] 1 0.0069    [2.005] 1  
A 1Pi 7960.1 762.46 2 Z 4.12  0.6590 2 3 4 0.00605 0.000025 0.000002  1.9075 A rarrow X R 7842.9 2 Z
missing citation
a (3Pi) 
X 1Sigma+ 0 5 997.94 Z 6.137  0.79059 O.OO664 -0.00002 0.000002  1.74153  


1Constants for the lowest observed level and interval, vibrational numbering unknown. From perturbations in A 1Pi.
2Vibrational numbering uncertain.
3Constants for the f component; Deltanufe ~ +0.00015J(J+1).
4The A 1Pi state is perturbed by three states, one of them being X 1Sigma+, another probably 1Delta.
5Theoretical calculations Verhaegen and Richards, 1967 support a 1Sigma ground state.
6From Gaydon Gaydon, 1968.


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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Gissane and Barrow, 1963
Gissane, W.J.M.; Barrow, R.F., Rotational analysis of a system B1«SIGMA»+ <-- X1«SIGMA»+ of BeS, Proc. Phys. Soc. London, 1963, 82, 1065. [all data]

Verhaegen and Richards, 1967
Verhaegen, G.; Richards, W.G., The ground state of the BeS molecule, Proc. Phys. Soc. London, 1967, 90, 579. [all data]

Gaydon, 1968
Gaydon, A.G., Dissociation energies and spectra of diatomic molecules, Chapman and Hall, Ltd., 3rd Edition, London, 1968, 1. [all data]


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