title: High-Resolution Infrared Laser Study of the nu(4) Absorption Band of cis-CHCl&dbond;CHF.
abstract: cis-1-Chloro-2-fluoroethylene was synthesized, and the gas-phase infrared spectrum was investigated in the nu(4) band region between 1321-1350 cm(-1), at a resolution of about 0.002 cm(-1), employing a tunable diode-laser spectrometer. This vibration of symmetry species A' gives rise to an a/b-hybrid band, even though our analysis pointed out that the intensity of the a-type component is predominant. Most of the J and K structure was resolved in different subbranches, and the rovibrational analysis led to the assignment of about 1900 a-type lines with J </= 71 and K(a) </= 20 for the (35)Cl isotopic species. The nu(4) fundamental is locally perturbed by a weak Coriolis resonance and some local crossings were found; the 3nu(12) state seems to be the most likely interacting level. Using Watson's A-reduction Hamiltonian in the I(r) representation, a set of spectroscopic parameters for the v(4) = 1 state was obtained. Copyright 1999 Academic Press.
authors.affiliation: Dipartimento di Chimica Fisica, Università Ca' Foscari di Venezia, D.D. 2137, Venice, I-30123, Italy
authors.initials: P
authors.lastname: Stoppa
authors.lastname: Pietropolli Charmet A
authors.initials: S
authors.lastname: Giorgianni
authors.initials: S
authors.lastname: Ghersetti