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Slow-down collisions and nonsequential double ionization in classical simulations.

R Panfili1, S L Haan, J H Eberly

  • 1Rochester Theory Center for Optical Science and Engineering and Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.

Physical Review Letters
|September 13, 2002
PubMed
Summary
This summary is machine-generated.

Classical simulations reveal a "slow-down" mechanism in nonsequential double-electron photoionization. Electron phase matching facilitates energy transfer, enabling escape over a suppressed barrier.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Dynamics
  • Computational Physics

Background:

  • Nonsequential double-electron photoionization is a complex atomic process.
  • Understanding electron correlation dynamics is crucial for attosecond science.

Purpose of the Study:

  • To analyze the dynamics of nonsequential double-electron short-pulse photoionization using classical simulations.
  • To identify key mechanisms governing double ionization in strong laser fields.

Main Methods:

  • Utilized a microcanonical ensemble of 10^5 two-electron classical trajectories.
  • Focused on analyzing the historical dynamics of trajectories within the doubly ionized subensemble.
  • Employed back-analysis of key events in the final doubly ionized state.

Main Results:

  • Identified a classical "slow-down" scenario as a key mechanism for nonsequential double ionization.
  • Observed that a good phase match between electron motions leads to effective energy transfer.
  • Demonstrated that this energy transfer facilitates electron escape over a suppressed ionization barrier.

Conclusions:

  • The classical slow-down scenario provides a new perspective on nonsequential double ionization dynamics.
  • Electron phase matching is a critical factor in enabling efficient double ionization.
  • Classical simulations offer valuable insights into complex quantum phenomena like double photoionization.