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The HC4O radical is an non-linear
molecule. Transitions with small quantum numbers
were reported by
(1) H. Kohguchi, Y. Oshima, and Y. Endo,
1994, J. Chem. Phys. 101, 6463.
The predictions should be sufficiently accurate
for the detection of the molecule in the cold ISM;
caution is advised for predicted frequencies above
80 GHz.
An ab initio dipole moment was taken
from
(2) S. Mohamed, M. C. McCarthy, A. L. Cooksy,
C. Hinton, and P. Thaddeus,
2005, J. Chem. Phys. 123, Art. No. 234301.
The value should be viewed with some caution.
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