silicon carbide
- Formula: CSi
- Molecular weight: 40.0962
- CAS Registry Number: 409-21-2
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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
| Symbol | Meaning |
|---|---|
| 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) |
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No spectra have been conclusively assigned to SiC. The following constants are from ab initio calculations Lutz and Ryan, 1974: | ||||||||||||
| a 1Σ+ | (6628) | (1018) | (0.695) | (1.70) | ||||||||
| * 3Σ- | (5597) | (606) | (0.556) | (1.90) | ||||||||
| * 3Πi | 0 1 | (983) | (0.606) | (1.82) 1 | ||||||||
Notes
| 1 | Lovas, 1974 assumes a 1Σ 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. |
| 2 | Thermochemical value (mass-spectrometry) Verhaegen, Stafford, et al., 1964. |
References
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.
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
Go To: Top, Constants of diatomic molecules, References
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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