Near infrared spectra of potential solids at the surface of Titan

Computer Science

Scientific paper

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Infrared Radiometers, Infrared Spectra, Infrared Spectroscopy, Solids, Spectrum Analysis, Surface Properties, Titan, Ethane, Ethylene, Ice, Methane, Near Infrared Radiation, Optical Properties

Scientific paper

The laboratory measurement of the optical properties in the near infrared (1 to 5 micrometers) of solid CH4, C2H6, and C2H4 and some of their mixtures is reported and results are given. With these data the spectra of three mixtures at a resolution comparable to the one of the near infrared spectrometer of the instrument of the Huygens probe were simulated. It was found that at the Descent Imager/Spectral Radiometer's (DISR's) resolution the best features to probe the composition of solid surface on Titan are near 6000, 7500, and 8600/cm for methane, near 7900, 7200, and 8400/cm for ethane and near 6100/cm for ethylene. In some cases concentrations lower than a few percent may be derived from the analysis of the complete infrared spectrum.

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