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Transition frequencies were summarized in
(1) A. Alasmari, C. Medcraft, K. Rolfe, C. Ennis,
and E. G. Robertson,
2024, J. Phys. Chem. A 128, 5969.
The authors provide extensive microwave data up to
high quantum numbers. Also used in the fit were earlier
lower millimeter wave data from
(2) T. Ikeda, K. V. L. N. Sastry, and R. F. Curl, Jr.,
1975, J. Mol. Spectrosc. 56, 411.
The quoted uncertainties in (1) are somewhat conservative.
The uncertainties applied here are closer to the ones
implicitely assumed in (1). The parameter set is
marginally different from the ones in (1).
The frequency calculation was truncated at J = 99.
The calculated transition frequencies should be
sufficiently accurate for observational purposes;
the ones with calculated uncertainties exceeding
0.1 MHz should be viewed with caution.
The dipole moment was determined in (2).
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