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- W2943788894 abstract "Context. The ice surface of Europa is unique due to its high concentration of sulfur compounds such as SO 4 , SO 2 , and H 2 S. Energetic ion impacts originating from the magnetosphere of Jupiter may alter the composition of the ice surface. Aims. We explore the chemical alteration of the surface due to a 20 MeV sulfur ion impact, for which the most pronounced effects are expected, and monitor the chemical transformations occurring inside the ice. Methods. Molecular dynamics simulations are used based on a reactive (REAX) potential, which allows for the molecular breakups and the ensuing reactions to be followed on an atomistic scale. Results. We observe dissociation of SO 4 and also a loss of SO 2 , while SO 3 is created; this is in qualitative agreement with laboratory experiments. Hydrolysis of water leads to abundant formation of H + , H 3 O + and OH − ; in addition, we predict the presence of both sulfurous acid, H 2 SO 3 , and sulfuric acid, H 2 SO 4 , as well as traces of carbonic acid, H 2 CO 3 . The irradiation produces H 2 and O 2 , which are free to escape from the surface, in agreement with the tenuous Europa atmosphere detected. Conclusions. Since magnetospheric sulfur ions have a high mass and may possess large energies, they provide a unique source of high energy deposition in the ice surface of Europa leading to abundant radiolysis fragments and products. In addition, sulfur compounds existing in the ice are chemically transformed, for example, by sulfite formation." @default.
- W2943788894 created "2019-05-09" @default.
- W2943788894 creator A5077051731 @default.
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- W2943788894 date "2019-05-01" @default.
- W2943788894 modified "2023-10-16" @default.
- W2943788894 title "High-energy ion impacts into the sulfur-bearing ice surface of Europa: an atomistic study of chemical transformations" @default.
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- W2943788894 doi "https://doi.org/10.1051/0004-6361/201935367" @default.
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