HIGH-RESOLUTION FTIR SPECTRUM OF VINYL FLUORIDE - ROVIBRATIONAL ANALYSIS OF THE TORSION MODE AT 712 CM(-1)

The high-resolution infrared spectra of vinyl fluoride have been recor ded using a Fourier transform spectrometer with a resolution of 0.0016 cm(-1). The rovibrational structure of the v(12) fundamental (torsion mode) at 712.3 cm(-1), which gives rise to a c-type band, was analyze d in detail employing modern methods of computations and graphical aid s. A comprehensive set of molecular constants for the first excited vi brational energy level of this band was obtained from the overall rovi brational assignment of almost 2500 transitions covering J and K-a val ues up to 40 and 16, respectively, in the region 640-770 cm(-1). The r otational and centrifugal distortion parameters obtained compare reaso nably well with those of the ground state, thus confirming that the v( 12) fundamental is essentially unperturbed. (C) 1995 Academic Press, I nc.