The data of the first entry of Feb. 2025 were extended. As earlier, accurate MW laboratory data are from
(1) Y. Kasai, K. Obi, Y. Ohshima, Y. Hirahara, Y. Endo, K. Kawaguchi, and A. Murakami, 1993, Astrophys. J. 410, L45;
and from
(2) V. D. Gordon, M. C. McCarthy, A. J. Apponi, and P. Thaddeus, 2001, Astrophys. J. Suppl. Ser. 134, 311.
The data in (2) are a subset of those in (1); the agreement is very good. Included are also several lower mmW transition frequencies from astronomical observations by
(3) R. Fuentetaja, C. Cabezas, Y. Endo, M. Agúndez, A. Godard Palluet, F. Lique, B. Tercero, N. Marcelino, P. de Vicente, and J. Cernicharo, 2025, Astron. Astrophys. 702, Art. No. A23.
Calculations beyond about 110 GHz should be viewed with caution.
The dipole moment is an estimate based on
(4) P. Botschwina, 2003, Phys. Chem. Chem. Phys. 5, 3337.