The entry is a modification of the first entry from July 2001. The main change is a significantly larger dipole moment because of mixing between the two lowest electronic states. The value is much better than the ealier one, but should be taken with some caution. The experimental lines were taken from
(1) M. C. McCarthy, C. A. Gottlieb, P. Thaddeus, M. Horn, and P. Botschwina, 1995, J. Chem. Phys. 103, 7820; and from
(2) W. Chen, S. E. Novick, M. C. McCarthy, C. A. Gottlieb, and P. Thaddeus, 1995, J. Chem. Phys. 103, 7828.
Transition frequencies with calculated uncertainties exceeding 0.2 MHz should be viewed with caution.
The ab initio dipole moment is assumed to be the same as for the main isotopomer (e049503.cat).
The ¹H and ¹³C hyperfine splitting is important only for very low N quantum numbers.