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W. CHEN, E. POULLET, J. BURIE, D. BOUCHER, Laboratoire de Physicochimie d'Atmosphère, CNRS UMR 8101, Université du Littoral Cote d'Opale, 145 Av. Maurice Schumann, 59140 Dunkerque, France.
A continuous-wave (cw) high-resolution mid-infrared spectrometer has been developed based on difference-frequency generation (DFG) by mixing two cw autoscanned Ti:Sapphire lasers in GaSe crystal. The DFG spectrometer is continuously tunable in the wide spectral region of 8-20 µm without any "mode hop", with a linewidth of
1 MHz.
DFG spectra of various volatile organic compounds, such as acetylene, ethylene, benzene, and toluene are investigated over the wavelength range from 10 to 15 µm with a resolution of
10-3 cm-1.
The present work is aimed at study of line parameters and its application to quantitative analysis of heavy molecules in the gas phase by vibrational absorption spectroscopy.