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Abstract
High resolution infrared FT spectra of the v 2 and v 3 bands of SPF3 have been recorded with linewidths of 2-3×10-3 cm-1 at ambient temperature. The region of the v 1 band centred at 984·92944(1) cm-1 has been studied in a supersonic jet and in a static sample at -80°C. The parallel bands have been rotationally analysed, and standard deviations of about 2 × 10-4 cm-1 have been achieved in the fits. Numerous hot bands, and some bands of 34SPF3, have been identified and analysed, mostly by polynomial methods. Whereas the v 2 and v 3 bands centred at 696·32639(2) and 441·55728(7) cm-1 are unperturbed, the v 1=1 level takes part in a polyad of interacting levels, including the levels v 4,v 2+v 6,v 3+2v 6 and v 5+2v 6. Therefore the parameters obtained for the v 1 = 1 level must be considered effective parameters. Accurate isotope shifts are reported for the fundamentals and are compared with previous results.