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Processus induits par les électrons de basse énergie (0-20 eV) dans les systèmes condensés

Abstract : This PhD memoir reports on the study of the reactive interactions between low energy (0-20 eV) electrons and condensed systems. These electrons induce in these media the formation of reactive fragments that can initiate reactions with the substrate, which results in the functionalization of the surface, or inside the film itself, which leads to the synthesis of new molecules. The first part deals with the characterization and the functionalization by organic groups of the surface of hydrogenated polycrystalline diamond. In particular it is shown that low energy electrons can induce the chemisorption of (CH2CN) groups after irradiation of two monolayers of acetonitrile CH3CN condensed on the diamond, following a reaction, resonant at 2 eV, for which a mechanism has been proposed. This study shows that low energy electrons can be used to induce the controlled functionalization of surfaces. The second part concerns the study of electron induced synthesis in molecular ices at low temperature. It is shown in particular the electron induced formation of carbon dioxide from several carboxylic acids, as well as more complex molecule synthesis, like the amino acid glycine from a mixed film CH3COOH:NH3 and the carbamic acid from the mixture CO2:NH3. In the latter cases, a reaction mechanism has been proposed. This study shows that low energy electrons, which are present in a large amount in any condensed system submitted to ionizing radiations (interstellar and stratospheric ices) as secondary electrons, can play a role in the chemistry of these media, and in particular in prebiotic chemistry of the interstellar medium.
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Submitted on : Monday, May 19, 2008 - 1:22:30 PM
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Mathieu Bertin. Processus induits par les électrons de basse énergie (0-20 eV) dans les systèmes condensés. Physique [physics]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00280603⟩

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