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With respect to the first entry from Mar. 2006,
the parameter set was modified slightly, and the parity
was altered for consistency reasons.
Most of the 2Π1/2 hyperfine split transition
frequencies have been reported by
(1) M. C. McCarthy, W. Chen,
A. J. Apponi, C. A. Gottlieb, and P. Thaddeus,
1999, Astrophys. J. 520, 158.
Additional millimeter lines without hyperfine
splitting were kindly provided by
(2) M. C. McCarthy, 2005, private communication.
The fit has been carried out employing parameters and
quantum numbers of Hund's case (b), as usual.
Concerning Hund's case (a) quantum numbers, levels with
J + 0.5 = N correlate with
2Π1/2 and levels with
J – 0.5 = N correlate with
2Π3/2 for J ≤ 11.5;
the correlation is reversed for J ≥ 12.5.
Predictions for the hyperfine splitting in the higher
lying 2Π3/2 spin component
as well as those for transitions above 400 GHz
should be viewed with caution.
The dipole moment is from an ab initio calculation
by
(3) D. E. Woon,
1995, Chem. Phys. Lett. 244, 45.
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