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The experimental lines were reported by
(1) M. C. McCarthy and P. Thaddeus,
2002, J. Mol. Spectrosc. 211, 228.
Data with Ka > 1 have
been omitted because they cannot be predicted reliably.
The predictions should be sufficient for astronomical
observations. They should be viewed with caution if
the predicted uncertainties exceed 0.1 MHz.
Spin-statistics matter for the intensities.
The nuclear spin-weight ratio is 3 : 1
for ortho-H2C2Si
: para-H2C2Si.
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) H. S. P. Müller and D. E. Woon,
2013, J. Phys. Chem. A 117, 13868.
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