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c-S4 tunnels between two equivalent minima
and only rotation-tunneling transitions are allowed.
Only levels with Ka and Kc
even are allowed in 0+ (state number 0), and
only levels with Ka and Kc
odd are allowed in 0– (state number 1).
The experimental FT microwave and millimeter lines were published
by
(1) S. Thorwirth, M. C. McCarthy, C. A. Gottlieb, P. Thaddeus,
H. Gupta, and J. F. Stanton,
2005, J. Chem. Phys. 123, Art. No. 054326.
Calculations should be viewed with caution once the uncertainties
exceed 100 kHz.
The dipole moment is from a quantum chemical calculation in (1).
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