The fit combines pure rotational as well as rovibrational data of three isotopic species. The OH^– rotational data were taken from
(1) F. Matsushima, T. Yonezu, T. Okabe, K. Tomaru, and Y. Moriwaki, 2006, J. Mol. Spectrosc., 235, 261; and
(2) D. J. Liu, W. C. Ho, and T. Oka, 1987, J. Chem. Phys., 87, 2442.
The OD^– rotational data were published by
(3) G. Cazzoli and C. Puzzarini, 2005, J. Chem. Phys., 123, Art.-No. 041101; and
(4) G. Cazzoli and C. Puzzarini, 2006, Astrophys. J., 648, L79.
Rovibrational transitions for OH^– and ¹⁸OH^– were taken from
(5) J. C. Owrutski, N. H. Rosenbaum, L. M. Tack, and R. J. Saykally, 1985, J. Chem. Phys., 83, 5338;
those of OD^– from
(6) B. D. Rehfuss, M. W. Crofton, and T. Oka, 1986, J. Chem. Phys., 85, 1785.
Predictions should be viewed with caution, in particular those with J > 10.
The dipole moment was assumed to agree with that of the main isotopic species, see e017502.cat.