CDMS

The lines have been reported by
(1) M. Caris, F. Lewen, and G. Winnewisser, 2002, Z. Naturforsch. 57a, 663. The data reported and used in the fit extend to v = 4. Vibrational energies stem from infrared transitions reported by
(2) H. Uehara, K. Horiai, K. Nakagawa, and T. Fujimoto, 1989, J. Mol. Spectrosc. 134, 98.
²³Na and ³⁷Cl hyperfine splitting is negligible except possibly for very low values of J. The partition function takes into account all states up to v = 6. Contributions of vibrational states to the partition function are available. Values for v = 5 - 6 have been extrapolated.
The dipole moments were taken from
(3) F. H. de Leeuw, R. van Wachem, and A. Dymanus, 1970, J. Chem. Phys. 53, 981.