The HC5S radical is a linear
molecule. Transitions with small quantum numbers
were reported by
(1) V. D. Gordon, M. C. McCarthy, A. J. Apponi,
and P. Thaddeus,
2002, Astrophys. J. Suppl. Ser. 138, 297.
The spectroscopic parameters are slightly different
from those in (1).
The predictions of the lower 2Π1/2
spin component should be sufficiently accurate
for the detection of the molecule in the cold ISM;
caution is advised for predicted frequencies above
60 GHz. Predictions of the higher
2Π3/2 spin component
should be viewed with great caution throughout.
The dipole moment was estimated.
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