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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)Cd35Cl
E (2Sigma) 45398.4 264.0 H 7.5 1        E rarrow X R 45363.3 H
missing citation; missing citation
C (2Pir) 32502 399.0 HQ 1.5        C larrow X V 32536 HQ
Walter and Barratt, 1929; Oeser, 1935; Howell, 1944; Rosen, 1970
31485 2          C larrow X V 31519 HQ
Walter and Barratt, 1929; Oeser, 1935; Howell, 1944; Rosen, 1970
B (2Sigma) 3           B rarrow X R 
Wieland, 1929; Wieland, 1948
X (2Sigma) 0 331.0 H 1.0         


1Predissociation suggested for v > 1.
20-0 sequence only. 5
3Unclassified emission bands, 11500 - 30000 cm-1. 6
4From temperature dependence of absorption spectrum Gaydon, 1968. Na D line chemiluminescence in Na/CdCl2 flames gives 1.3 eV leqD00 leq 2.1 eV [ Horn, Polanyi, et al., 1932, revised].
5Revised analysis Rosen, 1970.
6Constants suggested by Patel and Patel, 1966 are Te = 26010 Patel and Patel, 1966, omegae = 153.5 Patel and Patel, 1966, omegaexe = 3.75 Patel and Patel, 1966.


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

Walter and Barratt, 1929
Walter, J.M.; Barratt, S., The band spectra associated with zinc, cadmium, and mercury, Proc. R. Soc. London A, 1929, 122, 201. [all data]

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

Howell, 1944
Howell, H.G., The ultra-violet spectra and electron configuration of HgF and related halide molecules, Proc. R. Soc. London A, 1944, 182, 95. [all data]

Rosen, 1970
Rosen, B., International tables of selected constants. 17. Spectroscopic data relative to diatomic molecules, Pub. Pergamon Press, Oxford, 1970, 0. [all data]

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

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

Patel and Patel, 1966
Patel, M.M.; Patel, S.P., Emission spectrum of cadmium chloride - the visible system, Indian J. Pure Appl. Phys., 1966, 4, 388. [all data]


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