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The lines were reported by
(1) P. B. Changala, N. Genossar-Dan, E. Brudner, T. Gur,
J. H. Baraban, and M. C. McCarthy,
2023, Proc. Natl. Acad. Sci. USA 120, Art. No. e2303586120.
Several parameters were evaluated from the main isotopolog.
One line with large residual was omitted from the fit.
The calculation may be sufficiently accurate up to 50 GHz;
some caution may be advisable at higher frequencies.
1H hyperfine splitting may be resolved at
lower frequencies. Therefore, a separate calculation with
1H hyperfine splitting and J" ≤ 4
is available.
Note: The partition
function takes now into account the spin-multiplicity of
2 of the H nucleus in the HFS free calculation.
The dipole moment of the main isotopolog was taken from
a quantum-chemical calculation by
(2) D. E. Woon, 1996, Astrophys. J. 456, 602.
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