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Nonsequential Double Ionization by Counterrotating Circularly Polarized Two-Color Laser Fields.

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Summary
This summary is machine-generated.

We studied nonsequential double ionization in Argon using two laser fields. Results show ionization probability is controllable by laser intensity, driven by recolliding electrons.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Optics
  • Laser-Matter Interactions

Background:

  • Nonsequential double ionization (NDI) is a complex atomic process.
  • Understanding NDI mechanisms is crucial for attosecond science and high-harmonic generation.
  • Previous studies often used single laser fields, limiting control over ionization dynamics.

Purpose of the Study:

  • To investigate NDI of Argon (Ar) using two counterrotating circularly polarized laser fields.
  • To explore the influence of relative field intensities on the double ionization probability.
  • To identify the driving mechanism and electron dynamics in this controlled NDI process.

Main Methods:

  • Utilizing a laser pulse composed of two counterrotating circularly polarized fields at 390 nm and 780 nm.
  • Analyzing the dependence of the double-ionization probability on the relative intensity of the two fields.
  • Examining electron momentum distributions to understand the ionization pathways.

Main Results:

  • The double-ionization probability exhibits strong dependence on the relative laser field intensities.
  • A characteristic kneelike structure was observed in the ionization yield as a function of intensity.
  • Electron momentum distributions revealed signatures of both recolliding electrons and electrons emitted from excited Ar+ states.

Conclusions:

  • Nonsequential double ionization in Ar is driven by a beam of nearly monoenergetic recolliding electrons.
  • The intensity and energy of these recolliding electrons can be precisely controlled by adjusting the laser field parameters.
  • The findings provide insights into controlling electron dynamics in strong-field atomic ionization.