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Photoionisation simple et double à deux couleurs d'atomes de gaz rares

Abstract : The present work deals with simple and double ionization of rare gases by harmonic radiation produced by, and combined with, an intense femtosecond infrared laser. Technical aspects related to the use of harmonic generation and to the detection of ions and electrons in coincidence are exposed. Theoretical background for two colour, few photon, single and double ionization is detailled. Spectra and angular distributions of the photoelectrons measured in helium aredescribed and compared with TDSE theoretical calculations, for various conditions of the harmonic photons. The shape of the angular distributions can be explained within the frame of two distinct analytic approaches : the pertubation theory and the soft-photon approximation. The double ionization measurements have been performed on xenon, a complex atome characterized by many possible routes leading to double ionization. The analysis of energy and angular correlations of the two photoelectrons proves the feasibility of suchs experiments, which combine harmonic and infrared radiations. It shows that two step processes are dominant in the case of xenon. This work appeals for extending few photon, double ionization experiments to lighter rare gases.
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Submitted on : Thursday, July 24, 2008 - 10:33:26 AM
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O. Guyetand. Photoionisation simple et double à deux couleurs d'atomes de gaz rares. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2008. Français. ⟨tel-00305393⟩

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