The RKR potentials of six isotopologues of the hydrogen chloride molecule in the ground electronic state are calculated on the basis of previously determined values of the Dunham parameters Ymj up to v = 20 vibration level. The main isotopologue potential was approximated by the expansions of the zD = (r/re-1) and zS = (1- re/r) variables. Obtained results are compared to available literature data.
All currently known line positions of hydrogen chloride molecule (HCl) in the region from 7.4 to 18075 cm-1 were fitted. The reliability of the data sources as well as their consistency were analyzed. Some disagreements were found due to the systematic errors in determination of the line positions. New set of isotopically independent spectroscopic parameters was obtained and used for the calculation of vibration-rotation energy levels. A comparison of the calculated centers of lines with those of the Hitran database was done.
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