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silicon carbide


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
SymbolMeaning
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 28Si12C
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
No spectra have been conclusively assigned to SiC. The following constants are from ab initio calculations Lutz and Ryan, 1974:
a 1Sigma+ (6628) (1018)   (0.695)     (1.70)  
* 3Sigma- (5597) (606)   (0.556)     (1.90)  
* 3Pii 0 1 (983)   (0.606)     (1.82) 1  

Notes

1 Lovas, 1974 assumes a 1Sigma ground state and estimates re = 1.65 from an extrapolation to SiC of the shortening of Si-O, Si-N single bonds in the corresponding diatomic molecules.
2Thermochemical value (mass-spectrometry) Verhaegen, Stafford, et al., 1964.

References

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

Lutz and Ryan, 1974
Lutz, B.L.; Ryan, J.A., Silicon carbide: its ground state and predicted spectrum, Astrophys. J., 1974, 194, 753. [all data]

Lovas, 1974
Lovas, F.J., Small silicon molecules: possible sources of the unidentified molecular lines U81.5, U86.2, U89.2, and U90.7, Astrophys. J., 1974, 193, 265. [all data]

Verhaegen, Stafford, et al., 1964
Verhaegen, G.; Stafford, F.E.; Drowart, J., Mass spectrometric study of the systems boron-carbon and boron-carbon-silicon, J. Chem. Phys., 1964, 40, 1622. [all data]


Notes

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