DIODE-LASER SPECTROSCOPY OF THE NU-8 BAND OF CHLOROFLUOROMETHANE

The infrared spectrum of the nu8 band of natural CH2FCl has been recorded at a resolution of about 0.002 cm-1 in the range 1201-1270 cm-1 using a tunable diode laser spectrometer. This vibration of symmetry species A'' gives rise to a c-type band. The rovibrational analysis in the P, Q, and R branches led to the assignment of 1932 and 542 transitions belonging to the Cl-35 and Cl-37 isotopomers, respectively. From a simultaneous fit of GSCD of this work and the nu3 band, together with the literature microwave data, an improved set of ground state constants up to the quartic terms has been obtained using Watson's A-reduction Hamiltonian in the I(r) representation. A least-squares fit of the identified transitions provided excited state parameters of the nu8 band for both isotopic varieties with a standard deviation of about 6 x 10(-4) cm-1. (C) 1994 Academic Press, Inc.