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Astron. Astrophys. 333, 1025-1033 (1998)


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Profile of CH4 IR bands in ice mixtures

G. Mulas 1, 2, G.A. Baratta 3, M.E. Palumbo 3 and G. Strazzulla 3

1 Dipartimento di Scienze Fisiche dell'Università di Cagliari, Via Ospedale 72, I-09124 Cagliari, Italy
2 Osservatorio Astronomico di Cagliari, Str. 54, Loc. Poggio dei Pini, I-09012 Capoterra (CA), Italy
3 Osservatorio Astrofisico di Catania, V.le A. Doria 6, I-95125, Catania, Italy

Received 11 November 1997 / Accepted 28 January 1998

Abstract

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 CH4 bands as a function of initial mixture, irradiation dose and warming up temperature, and compared our results with previously published laboratory and observational data. Finally, we present a list of spectra that may be used for direct comparison with present and future observations.

Key words: molecular data – molecular processes – dust, extinction – ISM: molecules – infrared: ISM: lines and bands – methods: laboratory

Send offprint requests to: G. Strazzulla

© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998

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