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Dynamique d'états électroniques excités à la surface d'un film

Abstract : The present work concerns the dynamics of electronic excited states at the surface of a metal covered by a very thin dielectric ordered layer (Ar). We have studied how this layer modifies the properties of two types of excited states at surface : delocalised states (image states, image resonances, quantum well resonances) and localised states on molecular adsorbates at the surface. In order to describe the interaction between the excited electron and the Ar layer we have developed a parameter free microscopic model. This model takes into account the electronic and geometrical structures of the adsorbed layer on the metal. The properties of the delocalised electronic states (energy, lifetime, effective mass) as a function of the Ar layer thickness (from 1 to 4 monolayers) are discussed.We have shown that a very thin Ar layer exhibits an insulating character. The theoretical results concerning the image states on Cu(100) covered by Ar are compared to experimental results and the agreement between them is very good. We have observed quantum well resonances on the same system. These resonances have been confirmed experimentally afterwards. The existence and properties of image resonances on a free electron metal covered by an Ar layer are also discussed. The properties (energy and width) of the N^-_2 (^2 Pi_g) resonance of the nitrogen molecule adsorbed on an Ar monolayer deposited on a metal are calculated and discussed in terms of local (adsorption sites) and global (reflectivity of the Ar-vacuum interface) effects.
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Submitted on : Tuesday, March 15, 2005 - 4:08:04 PM
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Dana Codruta Marinica. Dynamique d'états électroniques excités à la surface d'un film. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2004. Français. ⟨tel-00008788⟩

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