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Excitation et ionisation des atomes d'hydrogène et d'hélium par des impulsions laser femtosecondes : approche théorique par des états de "Coulomb-Volkov"

Abstract : Abstract : We present a theoretical approach using "Coulomb-Volkov'' states that appears usefull for the study of atomic multiphotonic processes induced by intense XUV femtosecond laser pulses. It predicts hydrogen ionization spectra when it is irradiated by laser pulses in perturbations conditions. Three ways have been investigated. Extension to strong fields when ħω > Ip : it requires to include the hydrogen ground state population, introducing it in standard Coulomb-Volkov amplitude leads to saturated multiphotonic ionization. Extension to multiphotonic transitions with ħω < Ip : new quantum paths are open by the possibility to excitate the lower hydrogen bound states. Multiphoton excitation of these states is investigated using a Coulomb-Volkov approach. Extension to helium: two-photon double ionization study shows the influence of electronic correlations in both ground and final state. Huge quantity of informations such as angular and energetic distributions as well as total cross sections are available.
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https://tel.archives-ouvertes.fr/tel-00244653
Contributor : Roland Guichard <>
Submitted on : Thursday, February 7, 2008 - 12:41:53 PM
Last modification on : Monday, October 19, 2020 - 11:06:35 AM
Long-term archiving on: : Monday, May 10, 2010 - 2:52:49 PM

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  • HAL Id : tel-00244653, version 1

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Roland Guichard. Excitation et ionisation des atomes d'hydrogène et d'hélium par des impulsions laser femtosecondes : approche théorique par des états de "Coulomb-Volkov". Physique Atomique [physics.atom-ph]. Université Sciences et Technologies - Bordeaux I, 2007. Français. ⟨tel-00244653⟩

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