Abstract
cis-1-Chloro-2-fluoroethylene was synthesized, and the gas-phase infrared spectrum was investigated in the ν4 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 Ka ≤ 20 for the 35Cl isotopic species. The ν4 fundamental is locally perturbed by a weak Coriolis resonance and some local crossings were found; the 3ν12 state seems to be the most likely interacting level. Using Watson's A-reduction Hamiltonian in the Ir representation, a set of spectroscopic parameters for the v4 = 1 state was obtained.
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