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The molecule is better viewed as fluoropropadienylidenyl
rather than fluoropropynylidyne because of the cumulenic
CC bonds. Moreover, its non-linear character has a
sizable impact on the measured lines. Several components
of the three lowest rotational transitions have been
reported by
(1) T. Yoshikawa, Y. Sumiyoshi, and Y. Endo,
2009, J. Chem. Phys. 130, Art. No. 164303.
Information on higher K levels is available from
the ab initio rotational constants in (1). Because of the
magnitudes of the hyperfine and fine structure parameters,
the electron spin angular momentum was coupled to the
rotational angular momentum after the nuclear spin
angular momentum, in contrast to (1).
Predictions are limited to Ka = 0.
They may be sufficiently reliable up to about 100 GHz.
The partition function considers higher Ka
levels.
The ab initio a-dipole moment component was reported
in (1).
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