The experimental lines are from
(1) M. C. McCarthy, P. B. Changala, and P. B. Carroll,
2024, J. Mol. Spectrosc. 400, Art. No. 111886.
Only Ka = 0 transition were detected
thus far. The extrapolation should be good up to
possibly 150 GHz.
The dipole moment is from a quantum chemical
calculation by
(2) S. Thorwirth, and M. E. Harding,
2009, J. Chem. Phys., 130 Art. No. 214303.
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