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Related Experiment Videos

Ultrahigh harmonics from laser-assisted ion-atom collisions.

Manfred Lein1, Jan M Rost

  • 1Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Strasse 38, D-01187 Dresden, Germany.

Physical Review Letters
|December 20, 2003
PubMed
Summary

High-order harmonic generation in ion-atom collisions produces high-frequency photons. This occurs via electron capture and transfer or electron reflection and recombination mechanisms.

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Area of Science:

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

Background:

  • High-order harmonic generation (HHG) is a fundamental process in atomic physics.
  • Standard HHG typically involves laser ionization of atoms or molecules.
  • Ion-atom collisions offer a different pathway for HHG.

Purpose of the Study:

  • To theoretically analyze high-order harmonic generation (HHG) in ion-atom collisions.
  • To investigate the generation of high-frequency photons beyond standard HHG.
  • To elucidate the underlying mechanisms responsible for this phenomenon.

Main Methods:

  • Theoretical analysis of ion-atom collisions.
  • Modeling of high-order harmonic generation under intense laser fields.
  • Investigation of electron dynamics involving projectile and target atoms.

Main Results:

  • Observed emission of photons with frequencies significantly higher than in standard HHG.
  • Identified two distinct mechanisms contributing to harmonic generation.
  • Mechanism 1: Collisional electron capture and laser-driven inter-atomic electron transfer.
  • Mechanism 2: Laser-driven electron reflection from the projectile leading to recombination.

Conclusions:

  • Ion-atom collisions provide a viable route for generating extreme ultraviolet and X-ray photons.
  • The identified mechanisms offer new insights into electron dynamics in strong laser fields.
  • This work opens possibilities for novel light sources in the high-frequency regime.

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