Details of the fit have been published in
(1) H. S. P. Müller and S. Brünken, 2005, J. Mol. Spectrosc., 232, 213.
A considerable number of rotational transitions was taken from that work. Additional v₂ = 0, 1 transition frequencies were taken from the compilation of
(2) F. J. Lovas 1985, J. Phys. Chem. Ref. Data 14, 395; from
(3) S. C. Mehrotra, G. Bestmann, H. Dreizler, and H. Mäder, 1984, Z. Naturforsch. 39a, 633; from
(4) S. C. Mehrotra, H. Dreizler, and H. Mäder, 1984, Z. Naturforsch. 40a, 683; from
(5) P. A. Helminger and F. C. De Lucia 1985, J. Mol. Spectrosc. 111, 66; from
(6) E. A. Alekseev, S. F. Dyubko, V. V. Ilyushin, and S. V. Podnos 1996, J. Mol. Spectrosc. 176, 316; and from
(7) H. S. P. Müller, J. Farhoomand, E. A. Cohen, B. Brupbacher-Gatehouse, M. Schäfer, A. Bauder, and G. Winnewisser, 2000, J. Mol. Spectrosc., 201, 1.
Further v = 0 data were taken from
(8) S. P. Belov, M. Y. Tretyakov, I. N. Kozin, E. Klisch, G. Winnewisser, W. J. Lafferty, and J.-M. Flaud, 1998, J. Mol. Spectrosc. 191, 17.
The v₂ = 1 – 0 energy difference was determined by including ν₂ infrared transitions from
J.-M. Flaud, A. Perrin, L. M. Salah, and W. J. Lafferty, 1993, J. Mol. Spectrosc. 160, 272.
Transitions with uncertainties much larger than those at similar frequencies and with similar quantum numbers have not been merged.
The precision of the predicted uncertainties of the transition frequencies should be reliable up to about 3K"_a + J" ≈ 100. The calibration uncertainty has been estimated in (3) to be 0.0003 cm^–1.
The transition dipole moment has been derived from
(10) B. Sumpf, 1999, Spectrochim. Acta A 55, 1931.
The uncertainty in the transition dipole moment is about 8 %. NOTE: default intensities are given for 300 K ! The partition function includes both vibrational states. The individual contributions (> 0) are given in parentheses.