VIBRATION-ROTATION SPECTRA OF THE NU-1, NU-3 AND NU-5 PARALLEL BANDS AND POTENTIAL CONSTANTS OF CF3C-EQUIVALENT-TO-CH

The rotational structure in the parallel bands nu1, nu3 and nu5, of CF3C=CH is fully analysed at a resolution of 0.06 cm-1. The infrared band centres have been found, respectively, at 3328.673 1253.495 and 536.161 cm-1 and the main features of these three bands have been qualitatively explained. The rotational J structures of 235 lines were resolved and analysed by means of least-squares fits. Molecular parameters in the first excited level has been calculated. Potential-energy constants have been determined, using the iterative autoconsistency method.