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Étude théorique de l'ionisation d'agrégats métalliques simples par impact électronique

Abstract : In this work, we studied the simple ionization of metal cluster with closed layers. We undertook our studies within the framework of model of the spherical jellium in which the ionic structure is ignored. We treated the system of fermions (delocalized electrons) on the one hand, in the approximation of the local density depending on the time TDLDA which takes account of the dynamic correlations. The study of the cross sections doubling differential in approximation TDLDA for various moments of transfer enabled us to show the importance of the collective effects and to identify three areas of transfered energy. With low energy, we observed the phenomenon of interference between direct ionization and the discrete excitations. Around 6eV, one observes the plasmon of volume which corresponds to a collective resonance of the electrons delocalized in all the volume of the cluster. In the end, with high energy, as in the case of the photoionization, an oscillatory behavior of the cross sections appear. We applied our model to cluster charged which are the subject of experiments, we could identify a law of scale checked by the cross sections doubling differential (DDCS) of cluster belonging at the same isoelectronic sequence
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Submitted on : Tuesday, April 24, 2018 - 3:32:56 PM
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  • HAL Id : tel-01775457, version 1



Hafida Benali. Étude théorique de l'ionisation d'agrégats métalliques simples par impact électronique. Agrégats Moléculaires et Atomiques [physics.atm-clus]. Université Paul Verlaine - Metz, 2001. Français. ⟨NNT : 2001METZ011S⟩. ⟨tel-01775457⟩



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