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The lines of the 0+ and 0– states
have been summarized by
(1) R. D. Brown, P. D. Godfrey, R. Champion,
1987, J. Mol. Spectrosc. 123, 93.
The C3O chain of the molecule is bent with a small
barrier to linearity. Hence, there are two tunneling states.
The 0– state is 0.1198 cm–1 higher in
energy than the 0+ state.
The a type transitions are within each substate,
the b type transitions between the states.
Because of the limitations of the data set, extrapolations
beyond 100 GHz or beyond Ka larger than 5 or 1
for a and b type transitions, respectively,
should be viewed cautiously.
At low temperatures, it may be necessary to discern between
ortho-l-H2C3O
and para-l-H2C3O.
The ortho states are described by Ka odd and even
for the 0+ and 0– state, respectively,
the para states by Ka even and odd, respectively.
The nuclear spin-weights are 3 and 1 for
ortho-l-H2C3O
and para-l-H2C3O, respectively.
The JKaKc = 111 level
is the lowest ortho and para level
for the the 0+ and 0– state, respectively,
It is 5.2597 and 5.3795 cm–1, respectively, above ground.
The dipole moment was determined in
(2) R. D. Brown, P. D. Godfrey, R. Champion, D. Mc Naughton,
1981, J. Am. Chem. Soc. 103, 5711.
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