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Étude théorique de la dynamique électronique au cours de collisions entre des ions et des cibles atomiques hautement excitées

Abstract : The understanding of the electronic processes taking place during atomic collisions is of great interest for the modeling of phenomena observed in complex systems such as atmospheric, astrophysical and biological environments. These processes manifest at the microscopic level but play a determining role on the evolution and the physicochemical properties of these macroscopic systems. From a fundamental point of view, collisions are also privileged "laboratories" for the study of quantum systems with N-bodies. Ion-atom collisions are of crucial importance in several fields such as that concerning nuclear fusion by magnetic confinement: the understanding of the electronic processes is necessary for the modeling of this type of plasmas. This thesis is situated in this context and is dedicated to the theoretical study of the electronic processes that occur during collisions between ions and highly excited atomic targets. In this work, we privileged the modeling of the electronic capture and the computation of the cross sections for the proton-hydrogen system. We adopted two non-perturbative theoretical approaches: the classical CTMC method and a semi-classical SCAOCC method. We calculated the total and partial capture cross sections for targets initially excited up to the n = 7 layer. Comparisons between the results of these methods and the few theoretical data available are made and represent the originality of the work. Empirical scale laws for total cross sections are also described.
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Submitted on : Thursday, June 11, 2020 - 12:10:56 PM
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Abdelmalek Taoutioui. Étude théorique de la dynamique électronique au cours de collisions entre des ions et des cibles atomiques hautement excitées. Chimie théorique et/ou physique. Sorbonne Université; Université Moulay Ismaïl (Meknès, Maroc), 2018. Français. ⟨NNT : 2018SORUS323⟩. ⟨tel-02864787⟩



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