A complete line list for methane at 80 K (1.27 -1.71 micron) for planetary applications

Physics

Scientific paper

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Scientific paper

A line list has been constructed for methane at 80 K from spectra recorded by very high sensitivity laser techniques between 1.26 and 1.71 μm. The achieved sensitivity (min~10-10 cm-1) corresponds to a 1 % decrease of the light intensity after a 1000 km absorption pathlength. The WKMC line lists include lower state energy levels allowing accounting for the temperature dependence of the absorption between 80 K and 300 K. It covers the transparency windows at 1.58 and 1.28 μm which are of particular importance for the studies of the giant planets and Titan. The lines due to the CH3D and 13CH4 minor isotopologues have been identified. From simulations of the CH3D and methane spectra at low resolution, the CH3D isotopologue in "natural" abundance (5×10-4) has been found to contribute by up to 30% and 80 % of the very weak absorption near 1.58 μm at 296 and 80 K, respectively.

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