Analysis of the ν3 + ν7 combination band of CF2Cl2 from spectra obtained by high resolution diode laser and FTIR supersonic jet techniques
Literature Information
Giuseppe D'Amico, Marcel Snels, Hans Hollenstein, Martin Quack
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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