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Monobridged Si2H2 is higher
in energy than the dibridged isomer. Nevertheless,
it was observed readily.
The experimental lines are mostly
from
(1) M. Cordonnier, M. Bogey, C. Demuynck, and
J.-L. Destombes,
1992, J. Chem. Phys. 97, 7984.
The reported uncertainties were rather very conservative.
Evidently, very much smaller uncertainties were assumed
implicitely. The uncertainties used here are closer to
the implicitely assumed ones.
Few additional, low-frequency lines were taken
from
(2) M. C. McCarthy and P. Thaddeus,
2003, J. Mol. Spectrosc. 222, 248.
Should molecules with two Si atoms exist in
circumstellar envelopes of late-type stars,
then probably in the outer, cooler regions.
Therefore, the predictions should be sufficient
for astronomical observations.
Predictions with uncertainties larger than
0.3 MHz should be viewed with caution.
The dipole moment is from an ab initio
calculation by
(3) R. S. Grev and H. F. Schaefer III,
1992, J. Chem. Phys. 97, 7990.
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