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Irradiation effects in CO and CO2 ices induced by swift heavy Ni ions at 46 MeV and 537 MeV

Published online by Cambridge University Press:  09 March 2010

A. Domaracka ,
E. Seperuelo Duarte ,
P. Boduch ,
H. Rothard ,
E. Balanzat ,
E. Dartois ,
S. Pilling ,
L. S. Farenzena  and
E. F. da Silveira
A. Domaracka
Affiliation:
Centre de Recherche sur les Ions, les Matériaux et la Photonique, (CEA/CNRS/ENSICAEN/Université de Caen-Basse Normandie), CIMAP-CIRIL- Ganil, Boulevard Henri Becquerel, BP 5133, F-14070 Caen Cedex 05, France
E. Seperuelo Duarte
Affiliation:
Centre de Recherche sur les Ions, les Matériaux et la Photonique, (CEA/CNRS/ENSICAEN/Université de Caen-Basse Normandie), CIMAP-CIRIL- Ganil, Boulevard Henri Becquerel, BP 5133, F-14070 Caen Cedex 05, France Physics Department, Pontifícia Universidade Católica, Rua Marquês de S. Vicente 225, 22453-900 Rio de Janeiro, Brazil Grupo de Física e Astronomia - CEFET/Química de Nilópolis, Rua Lúcio Tavares, 1045, Centro 26530-060 Nilópolis, Brazil
P. Boduch
Affiliation:
Centre de Recherche sur les Ions, les Matériaux et la Photonique, (CEA/CNRS/ENSICAEN/Université de Caen-Basse Normandie), CIMAP-CIRIL- Ganil, Boulevard Henri Becquerel, BP 5133, F-14070 Caen Cedex 05, France
H. Rothard
Affiliation:
Centre de Recherche sur les Ions, les Matériaux et la Photonique, (CEA/CNRS/ENSICAEN/Université de Caen-Basse Normandie), CIMAP-CIRIL- Ganil, Boulevard Henri Becquerel, BP 5133, F-14070 Caen Cedex 05, France
E. Balanzat
Affiliation:
Centre de Recherche sur les Ions, les Matériaux et la Photonique, (CEA/CNRS/ENSICAEN/Université de Caen-Basse Normandie), CIMAP-CIRIL- Ganil, Boulevard Henri Becquerel, BP 5133, F-14070 Caen Cedex 05, France
E. Dartois
Affiliation:
Institute d'Astrophysique Spatiale (IAS), Astrochimie Expérimentale, UMR-8617 Université Paris-Sud, bâtiment 121, F-91405 Orsay, France
S. Pilling
Affiliation:
Physics Department, Pontifícia Universidade Católica, Rua Marquês de S. Vicente 225, 22453-900 Rio de Janeiro, Brazil Universidade do Vale do Paraíba (UNIVAP-IP&D), Av. Shihima Hifumi 2911, São José dos Campos, 12244-000 SP, Brazil
L. S. Farenzena
Affiliation:
Physics Department, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
E. F. da Silveira
Affiliation:
Physics Department, Pontifícia Universidade Católica, Rua Marquês de S. Vicente 225, 22453-900 Rio de Janeiro, Brazil
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Abstract

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In order to simulate the effects of the heavy ion component of cosmic rays on ices in astrophysical environments, the CO and CO2 ices were irradiated with swift nickel ions in the electronic energy loss regime. The ices were prepared by condensing gas onto a CsI substrate at a temperature of 14 K and analyzed by means of infrared (FTIR) spectroscopy. The physical process of deposition by Ni ions is similar to more important and abundant heavy cosmic rays such as Fe ions. Dissociation of the ice molecules, and formation of new molecules were observed. Also, sputtering (leading to desorption of molecules from the solid surface to the gas phase) was observed. It was found that the sputtering yield due to heavy ions cannot be neglected with respect to desorption induced by weakly ionizing particles such as UV photons and protons.

Keywords

astrochemistrymethods: laboratoryISM: cloudscosmic rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 428 - 429
Copyright
Copyright © International Astronomical Union 2010

References

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