The rotational transition frequencies were reported by
(1) R. A. Creswell, W. H. Hocking, E. F. Pearson, 1977, Chem. Phys. Lett. 48, 369.
Also used in the fit were extensive infrared measurements from
(2) C. E. Blom and H. G. Hedderich, 1988, Chem. Phys. Lett. 145, 143.
Additional parameters were taken from
(3) C. Focsa, A. Poclet, B. Pinchemel, R.J. Le Roy, and P.F. Bernath, 2000, J. Mol. Spectrosc. 203, 330.
Predictions should be reliable up to about 500 GHz.
Vibrational contributions have been considered in the calculation of the partition function. Values for the ground state are given in parentheses.
The dipole moment has been taken from an ab initio calculation by
(4) K. A. Peterson, 2010, unpublished.