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The lines have been reported by
(1) H. Linnartz, T. Motylewski, O. Vaizert, J. P. Maier,
A. J. Apponi, M. C. McCarthy, C. A. Gottlieb, and P. Thaddeus,
1999, J. Mol. Spectrosc. 197, 1.
The fit has been carried out using constants and
quantum numbers of Hund's case (b). Some higher order terms
have been estimated from respective C6H values.
The large number of
centrifugal distortion terms needed to fit the data within
experimental uncertainties seem to indicate the ground
vibronic state of C6D to be perturbed by a low
lying vibrational or electronic state. Further, because
of the number of these terms predictions above
200–250 GHz should be viewed with caution.
At low frequencies, the 2D hyperfine
splitting has been resolved both in the laboratory and
may be resolvable in space. Therefore, separate predictions with
hyperfine splitting are available for N' ≤ 15.
NOTE: the partition function does
take into account the hyperfine splitting !
The dipole moment is assumed to agree with that of the main
isotopic species, see e073501.cat.
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