Etude expérimentale et théorique de la structure électronique de l'aluminium en conditions extrêmes par spectroscopie d'absorption X

Abstract : Matter in extreme conditions belongs to Warm Dense Matter regime which lays between dense plasma regime and condensed matter. This regime is still not well known, indeed it is very complex to generate such plasma in the laboratory to get experimental data and validate models. The goal of this thesis is to study electronic structure of aluminum in extreme conditions with X-ray absorption spectroscopy. Experimentally aluminum has reached high densities and high temperatures, up to now unexplored. An X-ray source has also been generated to probe highly compressed aluminum. Two spectrometers have recorded aluminum absorption spectra and aluminum density and temperature conditions have been deduced thanks to optical diagnostics. Experimental spectra have been compared to ab initio spectra, calculated in the same conditions. The theoretical goal was to validate the calculation method in high densities and high temperatures regime with the study of K-edge absorption modifications. We also used absorption spectra to study the metal-non metal transition which takes place at low density (density < solid density). This transition could be study with electronic structure modifications of the system.
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Submitted on : Wednesday, November 13, 2013 - 5:32:35 PM
Last modification on : Wednesday, May 15, 2019 - 3:42:37 AM
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Floriane Festa. Etude expérimentale et théorique de la structure électronique de l'aluminium en conditions extrêmes par spectroscopie d'absorption X. Physique des plasmas [physics.plasm-ph]. Ecole Polytechnique X, 2013. Français. ⟨pastel-00904122⟩

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