Abstract
High resolution (0.0011 cm−1 full width half maximum) diode laser spectra have been measured for mixtures of CF2Cl2 in Ne, expanded in a supersonic planar jet. In addition interferometric Fourier transform infrared (FTIR) spectra have been recorded with a resolution of about 0.004 cm−1 (FWHM, Hamming apodization) for neat CF2Cl2, expanded through a circular 200 μm nozzle. We present the analysis of the ν3 + ν7 combination band of CF235Cl2 [0 = 888.496 89(10) cm−1] and CF235Cl37Cl [0 = 883.203 89(12) cm−1]. Absolute band strengths have been measured for all bands falling in the atmospheric window (ν3 + ν7, ν6, ν1 and ν8) and thus being important for monitoring CF2Cl2 in the lower troposphere and stratosphere. A Fermi resonance coupling constant W = (15 ± 2) cm−1 is estimated for the resonance between ν3 + ν7 and ν6 in both isotopomers.
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