High-resolution FTIR spectrum of vinyl chloride: rovibrational analysis ofthe v(10) and v(11) fundamental bands

The Fourier transform gas-phase infrared spectra of the nu(10) and nu(11) b ands of natural CH2-CHCl have been measured with a resolution of 0.005 cm(- 1) in the frequency range 820-1010cm(-1). These vibrations of symmetry spec ies A " give rise to c-type bands and the transitions observed are characte rized by Delta K-a = +/-1 and Delta K-c, = 0, +/-2. Both J and K structures have been resolved in different subbranches and about 1800 (J less than or equal to 64, K-a less than or equal to 13) and 2800 (J less than or equal to 72, K-a less than or equal to 14) transitions for the nu(10) and nu(11) fundamentals, respectively, have been identified for the Cl-35 isotopomer. Combined analysis of the assigned data with the available ground state cons tants allowed the determination of the band origins, rotational and centrif ugal distortion parameters for the nu(10) = 1 and nu(11) = 1 excited states of CH2=(CHCl)-Cl-35 isotopic species. The molecular constants obtained acc ount for slight perturbations in the nu(10) vibrational level.