Abstract
A technique to facilitate the assignment of congested high resolution IR spectra is presented. It involves subtraction of component spectra simulated from known spectroscopic constants. Application to the ν2 (1313.1 cm−1) and ν7 (1351.7 cm−1) bands of CHClF2 led to rovibrational line assignments for less intense and overlapping features including the minor isotopomer CH37ClF2 and c-type lines of CH35ClF2. The number of transitions assigned to the fundamental bands increased from 1721 to 6031 for 37Cl, and from 7496 to 9664 for 35Cl, with a greater range of rotational quantum numbers than found in a previous study. A total number of 1457, 484 and 262 line assignments were made for 210911, 710911 and 210611 hotbands respectively, features otherwise completely obscured in the observed spectrum. Rotational and centrifugal distortion parameters were fitted for all the upper states.
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