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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 August, 1977

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 28Si(80)Se
E 38505.9 308.8 H 1.95 -0.032       E larrow X R 38370.3 H
Vago and Barrow, 1946
D 1Pi 32450.3 399.8 H 1.93        D lrarrow X R 32360.2 H
missing citation; Vago and Barrow, 1946
a (3Pi1) (25077) [(412)] H         a rarrow X R 24993.73 H
Lebreton, Bosser, et al., 1975
X 1Sigma+ 0 580.0 H 1.78  0.1920117 1 0.0007767 1  0.842E-7 1  2.058324  
Hoeft, 1965


1Rotational constants for 28Si80Se; Hoeft, 1965 gives constants for eight isotopic species.
2From an extrapolation of the vibrational levels of the E 1Sigma+ state assuming dissociation into 3P2 + 3P2 Vago and Barrow, 1946, Barrow, 1970.


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.

Vago and Barrow, 1946
Vago, E.E.; Barrow, R.F., Ultra-violet absorption band-systems of SiS, SiSe and SiTe, Proc. Phys. Soc. London, 1946, 58, 538. [all data]

Lebreton, Bosser, et al., 1975
Lebreton, J.; Bosser, G.; Ferran, J.; Marsigny, L., New emission spectrum of silicon monoselenide, J. Phys. B:, 1975, 8, 141. [all data]

Hoeft, 1965
Hoeft, J., Das Mikrowellenrotationsspektrum des SiSe, Z. Naturforsch. A, 1965, 20, 1122. [all data]

Barrow, 1970
Barrow, In Rosen, 1970, 1970, 323. [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]


Go To: Top, Constants of diatomic molecules, References