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A global fit of data for all isotopic species and the
experimental lines have been summarized in
(1) H. S. P. Müller, M. C. McCarthy, L. Bizzocchi,
H. Gupta, S. Esser, H. Lichau, M. Caris, F. Lewen, J. Hahn,
C. Degli Esposti, S. Schlemmer, and P. Thaddeus,
2007, Chem. Phys. Phys. Chem., 9, 1579.
The newly recorded transitions extend to almost 1 THz
and to high vibrational states. Previous pure rotational data
from
(2) E. Tiemann, E. Renwanz, J. Hoeft, and T. Törring,
1972, Z. Naturforsch. 27a, 1566;
and from
(3) M. E. Sanz, M. C. McCarthy, and P. Thaddeus,
2003, J. Chem. Phys., 119, 11715;
as well as rovibrational data from
(4) C. I. Frum, R. Engleman, Jr., and P. F. Bernath,
1990, J. Chem. Phys., 93, 5457;
and from
(5) H. Birk and H. Jones,
1972, Chem. Phys. Lett. 175, 536
were also used in the fit.
The predictions should be adequate up to about 2 THz.
The dipole moment was assumed to agree with that of the main
species, see e060506.cat.
Vibrational states v ≤ 4 have been considered
for the calculation of the partition function. Contributions
are given in parentheses for v = 0.
Note: the 33S
hyperfine splitting may be resolvable at low value of J.
Therefore, a
separate hfs calculation is provided for J" up to 3.
The partition function does NOT take into account this
splitting. The partition function values have to be muliplied
by gI(33S) = 4 in these cases.
The 29Si hyperfine splitting should be negligible,
see documentation for 29SiS, e061507.cat.
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