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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., in press.
2021, Astron. Astrophys. 647, Art. No. A179.
(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 > 9
should be viewed with caution.
At low temperatures, it may be necessary to discern between
ortho-c-H2C318O and
para-c-H2C318O.
The ortho and para states are described by
Ka odd and even, respectively.
The nuclear spin-weights are 3 and 1 for
ortho-c-H2C318O
and para-c-H2C318O,
respectively. The JKaKc
= 111 level is the lowest ortho level.
It is 1.2678 cm–1 above ground.
The dipole moment of the main isotopolog was determined in (2).
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