1. Radiolysis and sputtering of carbon dioxide ice induced by swift Ti, Ni, and Xe ions.
- Author
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Mejía, C., Bender, M., Severin, D., Trautmann, C., Boduch, Ph., Bordalo, V., Domaracka, A., Lv, X.Y., Martinez, R., and Rothard, H.
- Subjects
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RADIOLYSIS , *SPUTTERING (Physics) , *CARBON dioxide , *TITANIUM , *INTERSTELLAR medium , *STELLAR winds - Abstract
Solid carbon dioxide (CO 2 ) 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 CO 2 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 CO 2 ice films (deposited on a CsI window) was monitored by mid-infrared absorption spectroscopy (FTIR). The dissociation rate of CO 2 , 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, CO 3 and O 3 were found to be linear in S e . [ABSTRACT FROM AUTHOR]
- Published
- 2015
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