The lines have been reported by
(1) M. C. McCarthy, and P. Thaddeus, 2005, J. Chem. Phys. 122, Art. No. 174308. The fit has been carried out using constants and quantum numbers of Hund's case (b). Slightly more centrifugal distortion terms compared to those of (1) were used in the fit as fixed parameters, see (1) and the C₆H entry, tag 073501.
The present data set comprises only of a small number of transitions partaining to the ²Π_3/2 spin-substate. Therefore, predictions above 100 GHz should be viewed with great caution. Moreover, predictions for the ²Π_1/2 spin-substate (J + 1/2 = N) are unreliable.
The ¹H and ¹³C hyperfine may be resolvable at low frequencies. The predictions consider both.
The dipole moment is assumed to agree with that of the main isotopic species, see e073501.cat.