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The experimental lines were reported by
(1) M. C. McCarthy and P. Thaddeus,
2002, J. Mol. Spectrosc. 211, 228.
Only Ka = 0 and 1 transition were detected
thus far. The extrapolation should be good up to possibly
87 GHz for these Ka; transition
frequencies involving higher values of Ka
should be viewed with increasing caution.
Spin-statistics matter for the intensities.
The nuclear spin-weight ratio is 3 : 1
for ortho-H2C4Si
: para-H2C4Si.
The ortho states are described by
Ka odd, the para
states by Ka even.
The dipole moment is from an ab initio calculation
by
(2) N. Job, A. Karton, K. Thirumoorthy, A. L. Cooksy,
and V. S. Thimmakondu,
2020, J. Phys. Chem. A 124, 987.
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