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dc.contributor.authorMejia Guaman, Christian Fernando
dc.contributor.authorDomaracka, Alicja
dc.contributor.authorDartois, Enmanuel
dc.contributor.authorGodard, Marie
dc.contributor.authorFrota Da silveira, Enio
dc.contributor.authorFerreira De barros, Ana Lucía
dc.contributor.authorBoduch, Philippe
dc.contributor.authorRothard, Hermann
dc.contributor.authorBrunetto, Rosario
dc.contributor.authorDing, Jing Jie
dc.contributor.authorPino, Thomas
dc.contributor.authorChabot, Marin
dc.contributor.authorThomas, Jean Charles
dc.identifier.issn0004-6361, e1432-0746
dc.description.abstractContext. Cosmic ray ion irradiation affects the chemical composition of and triggers physical changes in interstellar ice mantles in space. One of the primary structural changes induced is the loss of porosity, and the mantles evolve toward a more compact amorphous state. Previously, ice compaction was monitored at low to moderate ion energies. The existence of a compaction threshold in stopping power has been suggested. Aims. In this article we experimentally study the effect of heavy ion irradiation at energies closer to true cosmic rays. This minimises extrapolation and allows a regime where electronic interaction always dominates to be explored, providing the ice compaction cross section over a wide range of electronic stopping power. Methods. High-energy ion irradiations provided by the GANIL accelerator, from the MeV up to the GeV range, are combined with in-situ infrared spectroscopy monitoring of ice mantles. We follow the IR spectral evolution of the ice as a function of increasing fluence (induced compaction of the initial microporous amorphous ice into a more compact amorphous phase). We use the number of OH dangling bonds of the water molecule, i.e. pending OH bonds not engaged in a hydrogen bond in the initially porous ice structure as a probe of the phase transition. These high-energy experiments are combined with lower energy experiments using light ions (H, He) from other facilities in Catania, Italy, and Washington, USA. Results. We evaluated the cross section for the disappearance of OH dangling bonds as a function of electronic stopping power. A cross-section law in a large energy range that includes data from different ice deposition setups is established. The relevant phase structuring time scale for the ice network is compared to interstellar chemical time scales using an astrophysical model. Conclusions. The presence of a threshold in compaction at low stopping power suggested in some previous works seems not to be confirmed for the high-energy cosmic rays encountered in interstellar space. Ice mantle porosity or pending bonds monitored by the OH dangling bonds is removed efficiently by cosmic rays. As a consequence, this considerably reduces the specific surface area available for surface chemical reactions.
dc.sourceAstronomy & Astrophysics
dc.subjectISM molecules
dc.subjectCosmic rays
dc.subjectMolecular processes
dc.subjectLine profiles
dc.titleSwift heavy ion irradiation of water ice from MeV to GeV energies
dc.ucuenca.versionVersión publicada
dc.ucuenca.areaconocimientounescoamplio05 - Ciencias Físicas, Ciencias Naturales, Matemáticas y Estadísticas
dc.ucuenca.afiliacionThomas, J., Grand Accélérateur National d Ions Lourds (Ganil), Caen, Francia
dc.ucuenca.afiliacionDartois, E., Universidad Paris Saclay, Saint Aubin, Francia
dc.ucuenca.afiliacionDing, J., Université de Caen Normandie, Caen, Francia
dc.ucuenca.afiliacionFerreira, A., Centro Federal de Educación Tecnológica Celso Suckow da Fonseca, Río de Janeiro, Brasil
dc.ucuenca.afiliacionBoduch, P., Université de Caen Normandie, Caen, Francia
dc.ucuenca.afiliacionBrunetto, R., Universidad Paris Saclay, Saint Aubin, Francia
dc.ucuenca.afiliacionChabot, M., Universidad Paris Saclay, Saint Aubin, Francia
dc.ucuenca.afiliacionDomaracka, A., Université de Caen Normandie, Caen, Francia
dc.ucuenca.afiliacionGodard, M., Universidad Paris Saclay, Saint Aubin, Francia
dc.ucuenca.afiliacionMejia, C., Pontificia Universidade Catolica do Rio de Janeiro, Rio de Janeiro, Brasil
dc.ucuenca.afiliacionPino, T., Universidad Paris Saclay, Saint Aubin, Francia
dc.ucuenca.afiliacionRothard, H., Université de Caen Normandie, Caen, Francia
dc.ucuenca.afiliacionFrota, E., Pontificia Universidade Catolica do Rio de Janeiro, Rio de Janeiro, Brasil
dc.ucuenca.correspondenciaMejia Guaman, Christian Fernando, christian.mejia@ucuenca.edu.ec
dc.ucuenca.volumenVolumen 557, número A97
dc.ucuenca.areaconocimientofrascatiamplio1. Ciencias Naturales y Exactas
dc.ucuenca.areaconocimientofrascatiespecifico1.3 Ciencias Físicas
dc.ucuenca.areaconocimientofrascatidetallado1.3.8 Astronomía(Incluye Astrofísica, Ciencia Espacial)
dc.ucuenca.areaconocimientounescoespecifico053 - Ciencias Físicas
dc.ucuenca.areaconocimientounescodetallado0533 - Física
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