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Etude des atomes d'hélium et de béryllium en champ laser intense et bref

Abstract : We present a theoretical study of the interaction between a two-active electron atom and an intense (10e14 to 10e15 W/cm²) and ultrashort (from a few 10e-15 to a few 10e-18 s) laser field. In the first part, we describe the current experimental techniques able to produce a coherent radiation of high power in the UV-XUV regime and with femtosecond time duration. A theoretical model of a laser pulse is defined with such characteristics. Then, we develop a numerical approach based on B-spline functions to describe the atomic structure of the two-active electron system. A spectral non perturbative method is proposed to solve the time dependent Schrodinger equation. We focalize our attention on the description of the atomic double continuum states. Finally, we expose results on the double ionization of helium and beryllium atoms with intense and short laser field. In particular, we present total cross section calculations and ejected electron energy distributions in the double continuum after one- and two-photon absorption.
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Contributor : Stéphane Laulan <>
Submitted on : Tuesday, February 1, 2005 - 9:04:23 PM
Last modification on : Thursday, July 26, 2018 - 12:08:22 PM
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  • HAL Id : tel-00008322, version 1




Stéphane Laulan. Etude des atomes d'hélium et de béryllium en champ laser intense et bref. Physique Atomique [physics.atom-ph]. Université Sciences et Technologies - Bordeaux I, 2004. Français. ⟨tel-00008322⟩



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