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The background of the present entry is very similar to
the first one from July 2004/Jan. 2011.
The rotational lines were summarized by
(1) M. Caris, F. Lewen, H. S. P. Müller, and G. Winnewisser,
2004, J. Mol. Struct. 695–696, 243.
The data reported and used in the fit extend to v = 7
for this isotopic species. The predictions are based on a
combined fit of all isotopic species from (1).
The data set includes some lower frequency data from
(2) P. L. Clouser and W. Gordy,
1964, Phys. Rev. 134, 863.
Vibrational energies were derived from Yi0
values taken from
(3) E. J. Barton, C. Chiu, S. Golpayegani, S. N. Yurchenko,
J. Tennyson, D. J. Frohman, and P. F. Bernath,
2014, Mon. Not. R. Astron. Soc. 442, 1821.
In addition, three higher order parameters were estimated
from various trial fits based on the data from (1).
The predictions now extend to v = 15 and up to 2 THz.
Predictions should be viewed with caution for transitions
with calculated uncertainties above 0.2 MHz. Some caution is
also advised for transitions with v > 12.
Hyperfine effects due to the 39K and 35Cl
nuclei were not considered in the predictions
because of their small effects even at very low values of J.
The dipole moments were calculated from the formula below
taken from
(4) R. van Wachem and A. Dymanus,
1967, J. Chem. Phys. 46, 3749.
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