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Millimeter and submillimeter data were reported by
(1) H. S. P. Müller, A. Brahmi M., J.-C. Guillemin,
F. Lewen, and S. Schlemmer,
2021, Astron. Astrophys. 647, Art. No. A179.
Earlier, limited microwave data were taken from
(2) R. C. Benson, W. H. Flygare, M. Oda, and R. Breslow,
1973, J. Am. Chem. Soc. 95, 2772.
The data have been truncated at J = 50 and 500 GHz.
Transition frequencies involving Ka > 12
should be viewed with caution.
At low temperatures, it may be necessary to discern between
ortho-c-H2C213CO and
para-c-H2C213CO.
The ortho and para states are described by
Ka odd and even, respectively.
The nuclear spin-weights are 3 and 1 for
ortho-c-H2C213CO
and para-c-H2C213CO,
respectively. The JKaKc
= 111 level is the lowest ortho level.
It is 1.2781 cm–1 above ground.
The dipole moment of the main isotopolog was determined in (2).
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