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Transition frequencies were taken from
(1) M. C. McCarthy, K. L. K. Lee, P. B. Carroll, J. P. Porterfield,
P. B. Changala, J. H. Thorpe, and J. F. Stanton,
2020, J. Phys. Chem. A 124, 5170.
One typographical error in one transition frequency
was correct. The uncertainties were conservative and
were adjusted from 2 to 1 kHz. Initial estimates
of the quartic distortion parameters were taken from
a B3LYP calculation by
(2) H. S. P. Müller, 2021, unpublished.
The data set is rather limited. The calculations
were therefore truncated at 200 GHz and at
J = 50.
The calculations should be sufficient for searches
in cold environments. Transition frequencies with
calculated uncertainties exceeding 0.1 MHz should
be viewed with caution. Some caution is advised for
transitions with J larger than 20.
Spin-statistical weight ratios of 5 : 3 for levels
with Ka being even and odd,
respectively, have been taken into account.
The dipole moment is from
(3) P. A. Baron and R. D. Brown,
1973, Chem. Phys. 1, 444.
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