CO2 collision-induced line parameters in the ν3 band of CH4
Methane is present in the atmosphere of a large number of objects in the Solar system and beyond. Probing CH4 in these environments using optical remote sensing relies on the availability of appropriate information characterizing its spectrum. The present work aims to provide the spectroscopic information required to describe the effects of pressure on the infrared spectrum of methane in CO2 dominated atmospheres, to compensate for the scarcity of the information currently available [1-7]. High resolution Fourier transform spectra of methane diluted in carbon dioxide at total pressures up to 800 hPa have been recorded at 296.5 (5) K in the pentad region around 3.3 μm. Their analysis is being carried out using multi-spectrum fitting techniques  and a quadratic speed-dependent Rautian line shape model with line mixing. Results will be presented and discussed.
Acknowledgements: T. Bertin thanks the FRIA (Belgium) for a PhD fellowship. This work is financially supported by the Fonds de la Recherche Scientifique - FNRS (Belgium).
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