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Accurate MW laboratory data were reported by
(1) M. C. McCarthy, K. L. K. Lee, J. P. Porterfield,
P. B. Changala, and A. K. Eckhardt,
2021, Mol. Phys. 119, Art. No. e1975052.
Starting spectroscopic parameters were derived from the main isotopic species
by scaling parameters by appropriate powers of the ratios of the isotopolog
versus the main species. The rotational parameter B was fit;
c was estmated from quantum chemical calculations by
(2) H. S. P. Müller,
2018, unpublished;
bF was then fit.
Since the reasonable assumption that λ does not change upon isotopic substitution
will not hold strictly, calculations of most fine structure components with
J = N or N – 1 should be vied with caution.
Transition frequencies above 50 GHz should be viewed with some caution throughout.
The dipole moment was assumed to agree with that of the main isotopolog, see e80501.cat.
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