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 mm nozzle. We present the analysis of the n3+n7 combination band of CF235Cl2 (n0 = 888.49689(10) cm-1) and CF237Cl35Cl (n0 = 883.20389(12) cm-1). Absolute band strengths have been measured for all bands falling in the atmospheric window (n3+n7, n6, n1 and n8) 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 n3+n7 and n6 in both isotopomers.
Analysis of the n3+n7 combination band of CF2Cl2 from spectra obtained by diode laser and Fourier Transform Spectrometer supersonic jet techniques
Snels M;
2002
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 mm nozzle. We present the analysis of the n3+n7 combination band of CF235Cl2 (n0 = 888.49689(10) cm-1) and CF237Cl35Cl (n0 = 883.20389(12) cm-1). Absolute band strengths have been measured for all bands falling in the atmospheric window (n3+n7, n6, n1 and n8) 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 n3+n7 and n6 in both isotopomers.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
