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Microwave to lower submillimeter data were summarized
by
(1) M. Bogey, C. Demuynck, and J.-L. Destombes,
1988, J. Mol. Spectrosc. 132, 277.
The microwave data were contributed by
(2) L. H. Scharpen and V. W. Laurie,
1965, J. Chem. Phys. 43, 2765.
The data fit to roughly 30 kHz using an S-reduced Hamiltonian
after omission of three lines of (1) with slightly larger residuals.
The calculations were truncated at J = 80 and at 720 GHz.
The calculations may be sufficient for all observational purposes.
Transition frequencies with calculated uncertainties exceeding
0.2 MHz should be viewed with caution.
Spin-statistical weight ratios of 9 : 7 for levels with
Ka + Kc being even and odd,
respectively, have been taken into account.
The dipole moment was determined in
(3) V. W. Laurie,
1956, J. Chem. Phys. 24, 635.
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