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The lines have been reported by
(1) J. Cernicharo, C. A. Gottlieb, M. Guélin, P. Thaddeus, and J. M. Vrtililek,
1989, Astrophys. J. 341, L25 and
(2) M. Bogey, C. Demuynck, and J. L. Destombes,
1990, Astron. Astrophys. 232, L19.
The dipole moment is taken from an ab initio calculation reported in (1).
The spectra were fitted to a Hunds case (b) Hamiltonian.
Mar. 28, 2022: the correlation between
Hund's case (b) and (a) quantum numbers has been corrected:
J = N + 1 correlates with the low-lying Ω2
throughout (as before).
J = N – 1 correlates with Ω1 and
J = N with Ω0 for N = 3 to 8;
these are the astronomically most relevant transitions.
J = N correlates with Ω1 and
J = N – 1 with Ω0 for N = 1
and N ≥ 10. The correlation is more complex for N = 2 and
9. Hund's case (b) quantum numbers are therefore good quanta for
N ≥ 10.
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