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Étude théorique et expérimentale de la double ionisation par impact électronique incluant l'effet Auger: Interférences d'échanges et de processus

Abstract : In this work, double ionisation mechanisms of argon by electron impact in which the Auger effect is included have been studied as a function of the incident electron energy. Five and six fold differential cross sections in angle and in energy have been measured and analysed in a coplanar geometry. The efficiency of the apparatus has been improved by the use of a new toroidal analyser.
For the first time, the six fold differential cross section in which the Auger electron and the ejected electron with identical kinetic energies (205 eV) are involved, was measured at an incident energy of 956 eV in the case of argon. In the theoretical models developed during this work, the triple continuum is represented by a manifold of coulomb waves describing the interaction of all electrons with the residual ion. Exchange effects between electrons were also included in the models. Comparison between experimental and theoretical results allows to study the relative contribution of the Auger process and the direct double ionisation on the angular dependence five fold differential cross section. In particular, the Auger process contribution seems to become increasingly important as the incident energy is increased.
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https://tel.archives-ouvertes.fr/tel-00107969
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Submitted on : Thursday, October 19, 2006 - 1:36:54 PM
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Fabrice Catoire. Étude théorique et expérimentale de la double ionisation par impact électronique incluant l'effet Auger: Interférences d'échanges et de processus. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2006. Français. ⟨tel-00107969⟩

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