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The lines have been reported by
(1) M. D. Allen, T. C. Pesch, and L. M. Ziurys,
1996, Astrophys. J. 472, L57.
The energetically highest Ω = 1 fine structure component
(J = N – 1 in Hund's case (b)) was
initially assigned to the 54FeC minor isotopomer.
Its displacement in frequency is caused by interaction with the
nearby a 1Δ electronic state.
New, corrected predictions will be provided in the not too
distant future.
The dipole moment was taken from an ab initio calculation by
(2) I. Shim and K. A. Gingerich
1999, Eur. Phys. J. D 7, 163.
Even though the level employed is very high, the value might easily be different
by a factor of 1.5 because dipole moments are notoriously difficult to calculate
for transition metal compounds.
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