Seven very accurate low-N (≤ 2), low energy MW transition frequencies are from
(1) B. A. McGuire, M.-A. Martin-Drumel, K. L. K. Lee, J. F. Stanton, C. A. Gottlieb, and M. C. McCarthy 2018, Phys. Chem. Chem. Phys. 20, 13870.
Millimeter data were taken from
(2) S. Yamamoto, S. Saito, K. Kawaguchi, Y. Chikada, H. Suzuki, N. Kaifu, S.-I. Ishikawa, and M. Ohishi, 1990, Astrophys. J. 361, 318.
Included are also several important lower-N 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.
Transition frequencies with calculated uncertainties exceeding 0.1 MHz should be viewed with some caution.
The dipole moment is assumed to agree with that of the main isotopolog, see e056002.cat.