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Anne L'Huillier

Anne l'Huillier

Professor

Anne L'Huillier

Many-electron dynamics of heavy atoms in intense laser fields : Effects of screening and correlation

Author

  • Göran Wendin
  • Lars Jönsson
  • Anne L’huillier

Summary, in English

We discuss the role of many-electron interactions in multiphoton multielectron ionization of heavy atoms and try to indicate the relative importance of collective effects and screening, relaxation and shakeup, and Fermi sea correlations. The purpose of the work is to look for approximations in which the photoemission processes have been renormalized in consistent ways with respect to the field and the electron-electron interaction. This involves effective shift and broadening of energy levels, effective matrix elements for ionization by the field, effective fieldinduced density of states for the photoelectron, etc. In an application, we consider the low-intensity limit and discuss two-photon one-electron ionization of the 5p shell of Xe using a zero-field atomic basis set. This calculation demonstrates important ways in which collective effects may enter, and it also represents the first reported calculation of its kind. Finally, we apply the scheme for dressing the many-electron processes to a discussion of time scales in two-step double ionization, introducing the laser pulse duration in an intuitive way.

Publishing year

1987

Language

English

Pages

833-846

Publication/Series

Journal of the Optical Society of America B: Optical Physics

Volume

4

Issue

5

Document type

Journal article

Publisher

Optical Society of America

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0740-3224