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Radiolysis and sputtering of carbon dioxide ice induced by swift Ti, Ni, and Xe ions

Mejía, C. and Bender, M. and Severin, D. and Trautmann, C. and Boduch, Ph. and Bordalo, V. and Domaracka, A. and Lv, X. Y. and Martinez, R. and Rothard, H. (2015):
Radiolysis and sputtering of carbon dioxide ice induced by swift Ti, Ni, and Xe ions.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier Science BV, Netherlands, pp. 477-481, 365, ISSN 0168583X,
[Online-Edition: http://dx.doi.org/10.1016/j.nimb.2015.09.039],
[Article]

Abstract

Solid carbon dioxide (CO2) is found in several bodies of the solar system, the interstellar medium (ISM) and young stellar objects, where it is exposed to cosmic and stellar wind radiation. Here, the chemical and physical modifications induced by heavy ion irradiation of pure solid CO2 at low temperature (T = 15-30 K) are analyzed. The experiments were performed with Ti (550 MeV) and Xe (630 MeV) ions at the UNILAC of GSI/Darmstadt and with Ni ions (46 and 52 MeV) at IRRSUD of GANIL/Caen. The evolution of the thin CO2 ice films (deposited on a Csl window) was monitored by mid-infrared absorption spectroscopy (FTIR). The dissociation rate of CO2, determined from the fluence dependence of the IR absorption peak intensity, is found to be proportional to the electronic stopping power S-e. We also confirm that the sputtering yield shows a quadric increase with electronic stopping power. Furthermore, the production rates of daughter molecules such as CO, CO3 and O-3 were found to be linear in S-e. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Article
Erschienen: 2015
Creators: Mejía, C. and Bender, M. and Severin, D. and Trautmann, C. and Boduch, Ph. and Bordalo, V. and Domaracka, A. and Lv, X. Y. and Martinez, R. and Rothard, H.
Title: Radiolysis and sputtering of carbon dioxide ice induced by swift Ti, Ni, and Xe ions
Language: English
Abstract:

Solid carbon dioxide (CO2) is found in several bodies of the solar system, the interstellar medium (ISM) and young stellar objects, where it is exposed to cosmic and stellar wind radiation. Here, the chemical and physical modifications induced by heavy ion irradiation of pure solid CO2 at low temperature (T = 15-30 K) are analyzed. The experiments were performed with Ti (550 MeV) and Xe (630 MeV) ions at the UNILAC of GSI/Darmstadt and with Ni ions (46 and 52 MeV) at IRRSUD of GANIL/Caen. The evolution of the thin CO2 ice films (deposited on a Csl window) was monitored by mid-infrared absorption spectroscopy (FTIR). The dissociation rate of CO2, determined from the fluence dependence of the IR absorption peak intensity, is found to be proportional to the electronic stopping power S-e. We also confirm that the sputtering yield shows a quadric increase with electronic stopping power. Furthermore, the production rates of daughter molecules such as CO, CO3 and O-3 were found to be linear in S-e. (C) 2015 Elsevier B.V. All rights reserved.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 365
Publisher: Elsevier Science BV, Netherlands
Uncontrolled Keywords: Heavy ions, Astrophysical ices, Radiation chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Feb 2016 13:19
Official URL: http://dx.doi.org/10.1016/j.nimb.2015.09.039
Identification Number: doi:10.1016/j.nimb.2015.09.039
Funders: This work was co-funded by the European Commission, FP7 for RTD (2007-2013), Capacities Program (Contract No. 262010, ENSAR);, supported by the CAPES-COFECUB French-Brazilian exchange program and the CSC Chinese Scholarship Council., The Brazilian agencies CNPq (INEspaco) and FAPERJ are also acknowledged.
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