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The measurements of the lower spin component were
taken from
(1) M. C. McCarthy, A. L. Cooksy, S. Mohamed,
V. D. Gordon, and P. Thaddeus,
2003, Astrophys. J. Suppl. Ser. 144, 287.
Transition frequencies from astronomical observations were
also used; these improve the quality of the calculation slightly.
They were published by
(2) J. Cernicharo, C. Cabezas, M. Agúndez, R. Fuentetaja,
B. Tercero, N. Marcelino, and P. de Vicente,
2024, Astron. Astrophys. 688, Art. No. L13.
The calculation should be sufficient
for all observational purposes.
Transition frequencies with calculated uncertainties
exceeding 0.2 MHz should be viewed with caution.
The partition function takes into account the higher
spin component as far as possible at present.
The dipole moment is from a quantum chemical
calculation in (1).
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