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The microwave data were contributed by
(1) L. H. Scharpen and V. W. Laurie,
1965, J. Chem. Phys. 43, 2765.
Estimates of the quartic distortion parameters were derived
from an MP2 quantum-chemical calculation by
(2) H. S. P. Müller, 2021, unpublished;
following
(3) H. S. P. Müller, A. Brahmi M., J.-C. Guillemin,
F. Lewen, and S. Schlemmer,
2021, Astron. Astrophys. 647, Art. No. A179.
The data set is very small, but the calculations may be sufficient
for searches in cold sources. Transition frequencies with J
≥ 10 should be taken with caution as should those with
calculated uncertainties exceeding 0.1 MHz.
Spin-statistical weight ratios of 9 : 7 for levels with
Ka being even and odd, respectively,
have been taken into account.
The dipole moment was assumed to agree with that of the main
isotopolog, see e066520.cat, but it is along the a-axis.
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