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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 = 5
for this isotopic species. The predictions are based on a
combined fit of all isotopic species from (1).
Vibrational energies were derived from Yi0
values taken from
(2) 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 extend now greatly 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 > 10.
Hyperfine effects due to the 41K and 37Cl
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
derived by mass scaling from
(3) R. van Wachem and A. Dymanus,
1967, J. Chem. Phys. 46, 3749.
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