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High-Resolution Study of the ν3 Band of Chlorofluoromethane by Diode Laser Spectroscopy

Abstract The gas-phase infrared spectrum of natural CH 2 FCl has been investigated in the ν 3 region between 1336 and 1365 cm −1 , at a resolution of 0.002 cm −1 , using a tunable diode laser spectrometer. This vibration of A ′ symmetry species is expected to give origin to an a / b -type hybrid band with a structure approaching that of parallel and perpendicular bands of a prolate symmetric top. The rovibrational analysis led to the identification of more than 1300 ( J ≤ 41, K a ≤ 17) and 700 ( J ≤ 42, K a ≤ 11) transitions of the CH 2 F 35 Cl and CH 2 F 37 Cl ν 3 band centered at 1353.3173 and 1353.1962 cm −1 , respectively. From a simultaneous fit of GSCD of this work, together with literature microwave measurements, a set of ground-state constants up to the quartic coefficients has been obtained using the Watson′s A -reduction Hamiltonian in the I r representation. A number of K a subbands of the main species were found to be affected by Coriolis-type resonance, and the ν 6 + ν 9 vibrational level was identified as the perturber. A least-squares fit of the assigned transitions provided a set of effective upper-state constants for both the isotopomers. From spectral simulation it was found that the ν 3 band of CH 2 F 35 Cl is composed of about 80 and 20% a - and b -type components, respectively.