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The observed transition frequencies were taken from
(1) A. J. Apponi, M. C. McCarthy, C. A. Gottlieb, and P. Thaddeus,
2000,Astrophys. J. 530, 357.
The calculated value for the dipole moment was taken from
(2) S. A. Maluendes and A. D. McLean,
1992, Chem. Phys. Lett. 200, 511.
The calculations were truncated at 52 GHz and
Ka = 2. They are probably sufficient
for observations in cold environments. Transitions with
Ka = 2 should be viewed with some
caution, as should be those above 27 GHz.
At low temperatures, it may be necessary to discern between
ortho-l-C8H2 and
para-l-C8H2. The ortho states
are described by Ka odd, the para states
by Ka even. The nuclear spin-weights are
3 and 1 for ortho-l-C7H2 and
para-l-C7H2, respectively.
The JKaKc = 111
is the lowest ortho state. It is approximately
8.98 cm–1 above ground.
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