The transition frequencies are from
(1) D. Comte, M. Melosso, H. Kaur, E. A. Michael, T. E. Field-Theodore, W. G. D. P. Silva, D. F. Dinu, S. Alessandrini, L. Bizzocchi, S. Brünken, C. Puzzarini, S. Schlemmer, and O. Asvany, 2026, Phys. Chem. Chem. Phys. 28, 20659.
The frequencies should be sufficiently accurate not only in cold sources, but also in lukewarm sources (~50 K). Transition frequncies with calculated uncertainties exceeding 0.1 MHz should be viewed with caution. The ground state dipole moment components were taken from a quantum chemical calculation by
(2) D. Comte, H. Kaur, D. F. Dinu, S. Alessandrini, L. Bizzocchi, K. R. Liedl, O. Asvany, S. Thorwirth, S. Schlemmer, C. Puzzarini, S. Brünken, and M. Melosso, 2026, Chem. Phys. Lett. 889, Art. No. 142719.