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Radiolysis of astrophysical ices by heavy ion irradiation: destruction cross section measurement

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dc.contributor.author de Barros, A.L.F.
dc.contributor.author Boduch, P.
dc.contributor.author Domaracka, A.
dc.contributor.author Rothard, H.
dc.contributor.author da Silveira, E.F.
dc.date.accessioned 2017-05-23T14:59:55Z
dc.date.available 2017-05-23T14:59:55Z
dc.date.issued 2012
dc.identifier.citation Radiolysis of astrophysical ices by heavy ion irradiation: destruction cross section measurement / A.L.F. de Barros, P. Boduch, A. Domaracka, H. Rothard, E.F. da Silveira // Физика низких температур. — 2012. — Т. 38, № 8. — С. 953-960. — Бібліогр.: 44 назв. — англ. uk_UA
dc.identifier.issn 0132-6414
dc.identifier.other PACS: 34.50.–s, 61.80.–x, 33.20.Ea, 82.30.Fi
dc.identifier.uri http://dspace.nbuv.gov.ua/handle/123456789/117431
dc.description.abstract Many solar system objects, such as planets and their satellites, dust grains in rings, and comets, are known to either be made of ices or to have icy surfaces. These ices are exposed to ionizing radiation including keV, MeV and GeV ions from solar wind or cosmic rays. Moreover, icy dust grains are present in interstellar space and in particular in dense molecular clouds. Radiation effects include radiolysis (the destruction of molecules leading to formation of radicals), the formation of new molecules following radiolysis, the desorption or sputtering of atoms or molecules from the surface, compaction of porous ices, and phase changes. This review discusses the application of infrared spectroscopy FTIR to study the evolution of the chemical composition of ices containing the most abundant molecular species found in the solar system and interstellar medium, such as H₂O, CO, CO₂ and hydrocarbons. We focus on the evolution of chemical composition with ion fluence in order to deduce the corresponding destruction and formation cross sections. Although initial approach focused on product identification, it became increasingly necessary to work toward a comprehensive understanding of ice chemistry. The abundances of these molecules in different phases of ice mantles provide important clues to the chemical processes in dense interstellar clouds, and therefore it is of importance to accurately measure the quantities such as dissociation and formation cross sections of the infrared features of these molecules. We also are able to obtain the scaling of these cross sections with deposited energy. uk_UA
dc.description.sponsorship This work was supported by the region of “BasseNormandie” (France) and by the French-Brazilian exchange program CAPES-COFECUB. It is a pleasure to thank all the collaborators: E. Dartois, E. Seperuelo Duarte, S. Pilling, D. Andrade, V. Bordalo and also Th. Been and J.M. Ramillon, for technical support. The experiment was performed at the GANIL facility in Caen, France. The Brazilian agencies CNPq (INEspaço) and FAPERJ also provided partial support. uk_UA
dc.language.iso en uk_UA
dc.publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України uk_UA
dc.relation.ispartof Физика низких температур
dc.subject Low Temperature Spectroscopy and Radiation Effects uk_UA
dc.title Radiolysis of astrophysical ices by heavy ion irradiation: destruction cross section measurement uk_UA
dc.type Article uk_UA
dc.status published earlier uk_UA


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