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The lines were reported in
(1) M. Bogey, C. Demuynck, J.-L. Destombes, and A. Walters,
1991, Astron. Astrophys. 244, L47.
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, but they may still be a
bit conservative.
The sextic distortion parameter H was estimated
by comparison with the value of the isoelectronic HCP
Molecule.
Should iminosilylene exist in circumstellar envelopes
of late-type stars, then probably in the outer, cooler
regions. Therefore, the predictions should be sufficient
for astronomical observations. They should be reliable
at least up to 1 THz.
The dipole moment is from an ab initio calculation
by
(2) H. S. P. Müller and D. E. Woon,
2013, J. Phys. Chem. A 117, 13868.
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