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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)Cd19F
"Bands" found in emission in the same region Pearse and Gaydon, 1938 Howell, 1944 have been shown by Pearse and Feast, 1949 to be peculiar Cd lines.
Narrow continuum at 35400 cm-1, and unclassified bands in absorption at 35855, 35877, and 35897 cm-1.
E (2Sigma) (34200) (535) H         E larrow X 1 R 
Fowler, 1942
X (2Sigma) 0 (535) H          


1Rather diffuse heads.
2Estimated thermochemical value Besenbruch, Kana'an, et al., 1965.


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

Pearse and Gaydon, 1938
Pearse, R.W.B.; Gaydon, A.G., A note on the spectrum of cadmium fluoride, CdF, Proc. Phys. Soc. London, 1938, 50, 711. [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]

Pearse and Feast, 1949
Pearse, R.W.B.; Feast, M.W., Emission spectrum attributed to cadmium fluoride, Nature (London), 1949, 163, 686. [all data]

Fowler, 1942
Fowler, C.A., Jr., The absorption spectra of CdF and SnCl, Phys. Rev., 1942, 62, 141. [all data]

Besenbruch, Kana'an, et al., 1965
Besenbruch, G.; Kana'an, A.S.; Margrave, J.L., Knudsen and Langmuir measurments of the sublimation pressure of cadmium(II) fluoride, J. Phys. Chem., 1965, 69, 3174. [all data]


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