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Sur la physique atomique des ions dans les plasmas en présence de l'écrantage

Abstract : This work is an improvement of the characterisation of ionic species in plasmas. It is important to model the thermodynamics of these plasmas, especially in order to describe their ability to absorb radiations. The screening of ions by free electrons plays a crucial role in these thermodynamics. The number of electronic configurations in the plasma is huge, which makes their individual treatment prohibitive. A recently developed approach based on the " superconfiguration " approximation enables to group electronic configurations into several hundreds or thousands of relevant superconfigurations. Each superconfiguration is characterised by a potential and a one-electron-quantum-state basis calculated in a self-consistent way. The present work consists in a improvement of the superconfiguration method, in which the screening of ions by free electrons is taken into account and each ionic specie has the same plasma environment. Therefore, the proposed approach not only assures that the plasma is electrically neutral, by also gives, varying the volume of each ion sphere, the equality of the electronic pressure around each ion. This equality is obtained by a multi-dimensional Newton method. The latter calculation is complex but the method is definitely convergent and allows, in case of high-density plasmas (about density of solids) to take pressure ionisation phenomena into account. The influence of the new thermodynamics on photo-absorption spectra has been studied. Comparisons with experimental spectra obtained in LULI laboratory have been investigated. In the framework of dynamic linear response theory, a new sum rule for the induced dipolar density has been developed.
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Contributor : Jean-Christophe Pain Connect in order to contact the contributor
Submitted on : Monday, January 5, 2004 - 1:49:12 PM
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  • HAL Id : tel-00004088, version 1



Jean-Christophe Pain. Sur la physique atomique des ions dans les plasmas en présence de l'écrantage. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2002. Français. ⟨tel-00004088⟩



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