A vibrational analysis of the gas phase i.r. spectrum of CHFCl2

Abstract The gas-phase i.r. spectrum of natural CHFCl 2 was recorded under moderate resolution and a number of regions between 3100 and 350 cm −1 were analysed. All the fundamentals but ν 6 (lying at 277 cm −1 ) were observed and characterized; the band centre of the latter was evaluated by difference of suitable vibrational levels. Numerous combinations, ‘hot’ and ‘difference’ bands were assigned. The chlorine isotopic splitting pattern, often originating from a complex spectral structure, was also interpreted by the support of a normal coordinate analysis. Examples of possible Fermi resonance interactions were considered.