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The experimental lines are from
(1) B. Bak, O. J. Nielsen, H. Svanholt, A. Holm,
N. H. Tourbro, A. Krantz, and J. Laureni,
1979, Acta Chem. Scand. A 33, 161.
Some higher order centrifugal distortion constants
were estimated by
(2) H. S. P. Müller, 2022, unpublished.
Calculations of transition frequencies with
Ka = 0 and 1 may be reliable into the
3 mm range. Transition frequencies with Ka
larger than 1 should be viewed with increasing caution.
The calculation were limited to Ka = 5.
At low temperatures, it may be necessary to discern between
ortho-H2C13CS
and para-H2C13CS.
The ortho states are described by Ka odd,
the para states by Ka even.
The nuclear spin-weights are 3 and 1 for
ortho-H2C13CS
and para-H2C13CS, respectively.
The JKaKc = 111 level
is the lowest ortho level. It is 9.7393 cm–1 above ground.
The dipole moment of the main isotopolog was
determined by
(3) M. Winnewisser and E. Schäfer,
1980, Z. Naturforsch. A 35, 483.
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