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The experimental far-infrared lines are
from
(1) C. Camy-Peyret, J.-M. Flaud, L. Lechuga-Fossat,
and J. W. C. Johns,
1985, J. Mol. Spectrosc. 109, 300.
Several higher order terms were kept fixed to values
from D2S or were modified slightly.
Since no transition frequencies are available currently
that have been measured with microwave accuracy it is
recommended to view all predictions with some caution.
Nevertheless, predictions with calculated uncertainties
of less than 5 MHz and with quantum numbers
smaller than 5 should be quite reasonable.
At low temperatures, it may be necessary to discern
betweenortho-D234S
and para-D234S.
The ortho and para states are described by
Ka + Kc being
even and odd, respectively. The nuclear spin-weights are
2 and 1 for ortho-D234S and
para-D234S, respectively. The
JKaKc = 101
is the lowest para state.
It is 6.9490 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 2 for the separate ortho predictions
has been eliminated.
The dipole moment was assumed to agree with that
of D2S, see e036503.cat.
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