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Transition frequencies were taken
from
(1) C. Huiszoon,
1970, Rev. Sci. Instrum. 42, 477,
as well as from
(2) 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
(3) J.-M. Flaud, C. Camy-Peyret, and J. W. C. Johns,
1983, Can. J. Phys. 61, 1462.
The uncertainties of (2) seemed to be too large;
they have been lowered by a factor of two.
A very small number of frequencies from (3) whose
residuals exceeded three times the uncertainties
were omitted from the fit. Some higher order parameters
were taken from H2S.
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-H234S and
para-H234S.
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-H234S and
para-H234S, respectively. The
JKaKc = 101
is the lowest ortho state.
It is 13.7387 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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