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- W1553600056 abstract "<i>Context. <i/>Ices present in different astrophysical environments are exposed to ion irradiation from cosmic rays (H to heavier than Fe) in the keV to GeV energy range.<i>Aims. <i/>The objective of this work is to study the effects produced in astrophysical ices by heavy ions at relatively high energies (MeV) in the electronic energy loss regime and compare them with those produced by protons.<i>Methods. <i/>C<sup>18<sup/>O<sub>2<sub/> was condensed on a CsI substrate at 13 K and it was irradiated by 46 MeV <sup>58<sup/>Ni<sup>11+<sup/> up to a final fluence of cm<sup>-2<sup/> at a flux of cm<sup>-2<sup/> s<sup>-1<sup/>. The ice was analyzed in situ by infrared spectroscopy (FTIR) in the cm<sup>-1<sup/> range.<i>Results. <i/>The CO<sub>2<sub/> destruction was observed, as well as the formation of other species such as CO, CO<sub>3<sub/>, O<sub>3<sub/>, and C<sub>3<sub/>. The destruction cross section of CO<sub>2<sub/> is found to be cm<sup>2<sup/>, while those for the formation of CO, CO<sub>3<sub/>, and O<sub>3<sub/> molecules are cm<sup>2<sup/>, cm<sup>2<sup/>, and cm<sup>2<sup/>, respectively. The sputtering yield of the CO<sub>2<sub/> ice is molecules/impact, four orders of magnitude higher than for H projectiles at the same velocity. This allows us to estimate the contribution of the sputtering by heavy ions as compared to protons in the solar winds and in cosmic rays.<i>Conclusions. <i/>The present results show that heavy ions play an important role in the sputtering of astrophysical ices. Furthermore, this work confirms the quadratic stopping power dependence of sputtering yields." @default.
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- W1553600056 date "2009-06-04" @default.
- W1553600056 modified "2023-09-23" @default.
- W1553600056 title "Heavy ion irradiation of condensed CO$mathsf{_{2}}$: sputtering and molecule formation" @default.
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- W1553600056 doi "https://doi.org/10.1051/0004-6361/200811359" @default.
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