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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 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 to v = 5 and up to 1.9 THz.
Predictions should be viewed with caution for transitions
with calculated uncertainties above 0.2 MHz. Hyperfine
effects due to the 39K and 36Cl
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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