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Non-sequential double ionization with near-single cycle laser pulses.

A Chen1, M Kübel2,3, B Bergues4,3

  • 1Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, United Kingdom.

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|August 10, 2017
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Summary

This study uses a 3D semiclassical model to investigate argon double ionization by laser pulses. The model accurately reproduces experimental results, revealing insights into electron momentum and ionization pathways.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Mechanics
  • Laser-Matter Interactions

Background:

  • Understanding atomic ionization dynamics is crucial for fields like attosecond science and laser technology.
  • Previous studies have explored double ionization using various theoretical models and experimental techniques.

Purpose of the Study:

  • To investigate the double ionization of Argon (Ar) driven by intense near-infrared, near-single-cycle laser pulses.
  • To analyze electron momentum distributions and asymmetry parameters as a function of laser intensity and carrier-envelope phase.
  • To differentiate between direct and delayed ionization pathways and explain experimentally observed anti-correlation momentum patterns.

Main Methods:

  • Utilizing a three-dimensional semiclassical model to simulate the double ionization process.
  • Computing asymmetry parameters and electron momentum distributions.
  • Comparing model predictions with kinematically complete experimental data.

Main Results:

  • The semiclassical model shows excellent agreement with experimental findings for near-single-cycle laser pulses.
  • Direct and delayed ionization pathways were investigated, contributing to the understanding of electron emission.
  • An anti-correlation momentum pattern at higher intensities was reproduced, attributed to a transition from strong to soft electron recollisions.

Conclusions:

  • The 3D semiclassical model is a reliable tool for studying laser-driven double ionization.
  • The study provides a deeper understanding of electron recollision dynamics and ionization mechanisms.
  • The findings contribute to the interpretation of experimental results in strong-field physics.