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Etudes expérimentales des fractionnements isotopiques indépendants de la masse dans la réaction de formation de l'ozone en phase plasma

Abstract : The Earth's atmosphere has undergone, during its early history, very violent changes in its chemical composition. The emergence of the first photosynthetic living beings has led to the establishment and modification of major biogeochemical cycles. The use of isotopes as tracers of active physico-chemical processes during these periods has been developed since the 1980s. The observation of abnormal isotopic compositions in certain atmospheric molecules (ozone in particular), similar to those observed in meteorites by Clayton (1973), raises questions. Many hypotheses have been proposed to explain this "abnormal" phenomenon. The main objective of this doctoral work is to develop, through experimentation, the study of plasma reactions from an isotopic point of view. In particular, ozone formation third-body reactions, where the formation of an excited intermediate complex is involved in the mechanisms of generating these abnormal isotopic fractionations, will be studied.
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Lambert Baraut. Etudes expérimentales des fractionnements isotopiques indépendants de la masse dans la réaction de formation de l'ozone en phase plasma. Géochimie. Museum national d'histoire naturelle - MNHN PARIS, 2019. Français. ⟨NNT : 2019MNHN0002⟩. ⟨tel-02508590v2⟩

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