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Profile of CH 4 IR bands in ice mixtures

We studied the infrared spectral characteristics of frozen methane (CH4) in several astrophysically relevant ice mixtures, as deposited and after ion irradiation. We examined the profile (shape, width and peak position) of the CH 4 bands as a function of initial mixture, irradiation dose and warming up temperature, and compared our results with previously pub- lished laboratory and observational data. Finally, we present a list of spectra that may be used for direct comparison with present and future observations.