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The astronomical lines have been reported by
(1) J. Cernicharo, C. Cabezas, J. R. Pardo, M. Agúndez,
C. Bermúdez, L. Velilla-Prieto, F. Tercero, J. A.
López-Pérez, J. D. Gallego, J. P. Fonfría,
G. Quintana-Lacaci, M. Guélin, and Y. Endo
2019, Astron. Astrophys. 630, Art. No. L2.
For low N transitions hyperfine splitting due to the
1H nucleus may be resolvable.
Predictions at lower frequencies should be viewed with
some caution. The predictions should be quite reliable
up to 150 GHz.
The dipole moment was taken from an ab initio calculation
in (1).
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