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Astron. Astrophys. 334, 247-252 (1998)

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Profile of the CO2 bands produced after ion irradiation of ice mixtures

M.E. Palumbo 1, G.A. Baratta 1, J.R. Brucato 2, 3, A.C. Castorina 2, M.A. Satorre 4 and G. Strazzulla 1

1 Osservatorio Astrofisico di Catania, V.le A. Doria 6, I-95125 Catania, Italy
2 Istituto di Astronomia, Università di Catania, Città Universitaria, I-95125 Catania, Italy
3 Osservatorio Astronomico di Capodimonte, Napoli, Italy
4 Departament Fisica Aplicada EPSA (UPV), Escola Politecnica Superior Alcoi, Alicante, Spain

Received 18 June 1997 / Accepted 11 November 1997

Abstract

We have studied the infrared spectral characteristics of frozen carbon dioxide (CO2) formed after ion irradiation of several astrophysically relevant ice mixtures at 10 K. Carbon dioxide is in fact readily produced by ion irradiation of icy samples of CO, and CH3 OH and mixtures H2 O:CO, CO:O2,
CO:N2, H2 O:CH3 OH, H2 O:CH4, H2 O:CH4:NH3. We have studied the profile (shape, width and peak position) of the CO2 bands as a function of initial mixture, irradiation dose and warming up temperature.

Key words: ISM: molecules – dust, extinction – infrared: ISM: lines and bands

Send offprint requests to: M.E. Palumbo (mepalumbo@alpha4.ct.astro.it)

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© European Southern Observatory (ESO) 1998

Online publication: May 12, 1998

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