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Transition frequencies were taken
from
(1) A. H. Saleck, M. Tanimoto, S. P. Belov, T. Klaus,
and G. Winnewisser,
1995, J. Mol. Spectrosc. 171, 481.
Also included in the fit are far-infrared
transitions from
(2) J.-M. Flaud, C. Camy-Peyret, and J. W. C. Johns,
1983, Can. J. Phys. 61, 1462.
The uncertainties of (1) seemed to be too large;
they have been set to 50 and 100 kHz for the most
part. The data from (2) were not quite reproduced
within experimental uncertainties. Since the rms
error was with about 1.2 only slightly larger than 1.0
and since there were no transitions whose residuals
exceeded three times the uncertainties no adjustments
of the uncertainties were made. Some higher order
parameters were taken from H2S.
33S hyperfine splitting was retained
throughout the predictions because it is
important for the low energy transitions
and can not be neglected for many higher energy
transitions.
The predictions should be reliable as long as the
uncertainties do not exceed 5 MHz.
At low temperatures, it may be necessary to discern between
ortho-H233S and
para-H233S.
The ortho and para states are described by
Ka + Kc being
odd and even, respectively. The nuclear spin-weights are
3 and 1 for ortho-H233S and
para-H233S, respectively. The
JKaKc = 101
is the lowest ortho state.
It is 13.742 cm–1 above ground.
Aug. 2011: separate
para and
ortho predictions are available along with separate
para and
ortho partition function values. Note:
the spin-weight of 3 for the separate ortho predictions
has been eliminated.
The dipole moment was assumed to agree with that of
H2S, see e034502.cat.
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