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The experimental data were taken from
(1) D. Priem, J. Cosléou, J. Demaison, I. Merke,
W. Stahl, W. Jerzembeck, and H. Bürger,
1998, J. Mol. Spectrosc. 191, 183.
The predictions should be reliable throughout.
14N hyperfine splitting was resolved in
laboratory measurements, but are deemed to be unimportant
for astronomical observations.
Note:
At low temperatures, it may be necessary to discern between
A-SiH3CN and E-SiH3CN.
The A state levels are described by
K = 3n, those of E state
by K = 3n ± 1.
The nuclear spin-weight ratio is 2 : 1 for
A-SiH3CN with K > 0
and all other states, respectively.
The dipole moment was determined in (1).
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