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The experimental lines were taken from
(1) W. M. Stigliani, V. W. Laurie, and J. C. Li,
1975, J. Chem. Phys. 62, 1890;
(2) M. Bogey, C. Demuynck, J. L. Destombes, and J. C. Guillemin,
1986, Chem. Phys. Lett. 125, 569;
and from
(3) J. M. Vrtilek, C. A. Gottlieb, T. J. LePage, and P. Thaddeus,
1987, Astrophys. J. 316, 826.
Some transitions frequencies have been determined both in (2)
and (3); these were found to differ by an average of about 40
kHz – outside of the combined uncertainties of mostly
20 and 10 kHz, respectively. The source of the discrapancies
could not be determined unambiguously. Therefore, uncertainties
of the transition frequencies in (1-3) were set to 50 kHz,
unless already larger than that.
The dipole moment is from
(4) P. H. Kasai, R. J. Myers, D. F. Eggers, and K. B. Wiberg,
1959, J. Chem. Phys. 30, 512.
Spin-statistical weight ratios of 5 : 3 for levels having
Ka even and odd, respectively, have been
taken into account.
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