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The initial lines were reported by
(1) M. A. Anderson and L. M. Ziurys,
1995, Astrophys. J. 444, L57.
With respect to the first entry of Oct. 2011, hyperfine
resolved data were included in the fit. These were
taken from
(2) 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.
The calculations should be sufficiently accurate for
observational purposes. Caution is advised above 600 GHz.
1H hyperfine splitting may be resolved at
lower frequencies. Therefore, a separate calculation with
1H hyperfine splitting and J" ≤ 6
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 was taken from
(3) A. J. Marr, J. Perry, and T. C. Steimle,
1995, J. Chem. Phys. 103, 3861.
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