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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 November, 1974

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 (114)Cd(79)Br
C (2Pi3/2) 31463 253.8 1 H 0.73        C lrarrow X V 31474 H
Wieland, 1929; Ramasastry, 1949; missing citation
C (2Pi1/2) (30300) 2         C lrarrow X V 30310 H
Ramasastry, 1949; Darji, 1970; missing citation
B (2Sigma) 3           B rarrow X R 
Wieland, 1929; Oeser, 1935; Wieland, 1948; Ramasastry, 1949; Patel and Patel, 1967
X (2Sigma) 0 230.5 1 H 0.50         


1Average of constants given in Wieland, 1929 (emission) and Gosavi, Greig, et al., 1971 (absorption).
2No agreement between constants derived from the analysis of the emission spectrum by Darji, 1970 (omegae = 237.0, omegaexe = 0.50) and of the absorption spectrum by Gosavi, Greig, et al., 1971 (omegae = 253.0, omegaexe = 2.30).
3Unclassified emission bands, 12300 - 30300 cm-1. 5
4Na D line chemiluminescence in Na/CdBr2 flames [ Horn, Polanyi, et al., 1932, revised].
5Constants suggested by Patel and Patel, 1967 are Te = 24823, omegae = 105.4, omegaexe = 1.70.


Go To: Top, 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.

Wieland, 1929
Wieland, K., Bandenspektren der quecksilber-, cadmium- und zinkhalogenide, Helv. Phys. Acta, 1929, 2, 46. [all data]

Ramasastry, 1949
Ramasastry, C., Band spectrum of cadmium bromide, Indian J. Phys., 1949, 23, 453. [all data]

Darji, 1970
Darji, A.B., The ultraviolet bands (C-system) of CdBr molecule, Indian J. Pure Appl. Phys., 1970, 8, 240. [all data]

Oeser, 1935
Oeser, E., Absorptions- und Fluoreszenzuntersuchungen an dampfformigen Cadmium und Zinkhalogeniden, Z. Phys., 1935, 47, 699. [all data]

Wieland, 1948
Wieland, K., Molekulspektren mit Ionencharakter und ihre Beeinflussung durch Fremdgase in Contribution a l'Etude de la Structure Moleculaire, Desoer, Liege, ed(s)., 1948, 229-238. [all data]

Patel and Patel, 1967
Patel, M.M.; Patel, S.P., The emission spectrum of the CdBr molecule (the visible system), Indian J. Phys., 1967, 41, 155. [all data]

Gosavi, Greig, et al., 1971
Gosavi, R.K.; Greig, G.; Young, P.J.; Strausz, O.P., Reactions of metal atoms. IV. The UV spectra of CdBr, CdI, ZnBr, and ZnI, J. Chem. Phys., 1971, 54, 983. [all data]

Horn, Polanyi, et al., 1932
Horn, E.; Polanyi, M.; Sattler, H., Uber die hochverdunnten flammen von natriumdampf mit den cadmiumhalogeniden und zinkchlorid, Z. Phys. Chem. Abt. B, 1932, 17, 220. [all data]


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