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A combined fit of several isotopic species and
various vibrational states has been performed.
Ground state lines of the main isotopolog were taken
from
(1) S. K. Lee, H. Ozeki, and S. Saito,
1995, Astrophys. J. Suppl. Ser. 98, 351.
The stated uncertainties, with which the peak positions
have been determined, are only a vague indication of
the uncertainties of the transition frequencies, as
is commonly found for data from that laboratory.
With assumed uncertainties of 20 kHz for most of
the lines, all but one line could be reproduced
overall within the uncertainties.
Excited state transitions were taken from
(2) J. R. Anacona, M. Bogey, P. B. Davies, C.
Demuynck, J. L. Destombes,
1986, Mol. Phys. 59, 81.
Ground state transitions for the 34S
isotopolog were reported by
(3) F. J. Lovas, and R. D. Suenram,
1982, J. Mol. Spectrosc. 93, 416;
and by
(4) A. H. Saleck, H. Ozeki, and S. Saito,
1995, Chem. Phys. Lett. 244, 199.
One transition from (3) and two from (4) were omitted
from the final fit. (4) also contained data for the
33S and 15N isotopic species.
Infrared transitions were taken from
(5) A. Sinha, J. B. Burkholder, P. D. Hammer,
C. J. Howard,
1988, J. Mol. Spectrosc. 130, 466.
A00 and Y20 were
derived from data in
(6) A. Jenouvrier and B. Pascat,
1973, Can. J. Phys. 51, 2143.
Note: Hyperfine splitting
has been neglected in the present calculation. The degeneracy
of the levels has been adjusted.
The partition function takes into account states up
to v = 2; ground state values
are given in parentheses.
The ab initio transition dipole moment is from
(7) H. S. P. Müller, 2011, unpublished.
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