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Si2C is a bent molecule with a fairly low barrier
to linearity which is probably responsible for the large
centrifugal distortion effects.
The parameters and transition frequencies have been taken
from
(1) J. Cernicharo, M. C. McCarthy, C. A. Gottlieb, M. Agúndez,
L. Velilla-Prieto, J. H. Baraban, P. B. Changala, M. Guélin,
C. Kahane, M. A. Martin-Drumel, N. A. Patel, N. J. Reilly,
J. F. Stanton, G. Quintana-Lacaci, S. Thorwirth, and K. H. Young,
2015, Astrophys. J., 806 Art. No. L3.
The authors state that predictions with J up to 60
and Ka up to 5 should be reliable up to
400 GHz.
The ground state dipole moment is from an ab initio
calculatio from
(3) W. Gabriel, G. Chambaud, P. Rosmus, A. Spielfiedel,
and N. Feautrier,
1992, Astrophys. J., 398 706.
NOTE: The partition function takes
into account the ground vibrational state only.
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