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Nonsequential double recombination in intense laser fields.

P Koval1, F Wilken, D Bauer

  • 1Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany.

Physical Review Letters
|March 16, 2007
PubMed
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Researchers observed a second plateau in harmonic spectra of laser-driven two-electron atoms. This phenomenon, explained by simultaneous electron recombination, extends beyond the typical cutoff, offering new insights into atomic physics.

Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Laser-Matter Interactions

Background:

  • Harmonic spectra in laser-driven atoms reveal electron dynamics.
  • Previous studies focused on single-electron recombination dynamics.
  • Understanding two-electron atomic responses to intense lasers is crucial.

Purpose of the Study:

  • To investigate the harmonic spectra of laser-driven two-electron atoms.
  • To identify and explain phenomena beyond the standard harmonic cutoff.
  • To elucidate the role of multi-electron dynamics in high-harmonic generation.

Main Methods:

  • Numerical solution of a low-dimensional model helium atom.
  • Application of an extended strong field approximation.
  • Analysis using classical trajectory models and time-frequency analysis of quantum results.

Related Experiment Videos

Main Results:

  • Observation of a second plateau in harmonic spectra for two-electron atoms.
  • Harmonics beyond the usual cutoff arise from simultaneous recombination of two electrons emitted in different half-cycles.
  • Classical trajectories accurately predict the new cutoff and quantum results.

Conclusions:

  • The observed second plateau is attributed to a novel multi-electron recombination mechanism.
  • This mechanism is analogous to the inverse single photon double ionization process.
  • The findings advance the understanding of complex electron dynamics in strong laser fields.