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Electron Dynamics and Correlations During High-Order Harmonic Generation in Be.

Eric Kutscher1, Anton N Artemyev1, Philipp V Demekhin1

  • 1Institut für Physik und CINSaT, Universität Kassel, Kassel, Germany.

Frontiers in Chemistry
|February 17, 2022
PubMed
Summary

We theoretically explored high-order harmonic generation in beryllium atoms using intense laser pulses. Our study reveals how different physical processes collectively enhance the harmonic spectrum.

Keywords:
electron correlationshigh-harmonic generationlight-matter interactionrestricted-active-spacestrong-field ionisationtheoretical and numerical methods

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Strong-Field Physics

Background:

  • High-order harmonic generation (HHG) is a fundamental process in strong-field physics.
  • Understanding HHG in atoms requires accurate theoretical modeling of electron dynamics.
  • Beryllium atoms present a unique system for studying HHG due to their electronic structure.

Purpose of the Study:

  • To theoretically investigate high-order harmonic generation in a beryllium atom.
  • To analyze the effects of a short 1850 nm linearly polarized laser pulse.
  • To explore the intermediate strong-field ionization regime (Keldysh parameter = 0.85).

Main Methods:

  • Solving the time-dependent Schrödinger equation (TDSE).
  • Utilizing the time-dependent restricted-active-space configuration-interaction (TD-RASCI) method.
  • Systematically increasing the active space to isolate physical process contributions.

Main Results:

  • The TD-RASCI method accurately models HHG in beryllium.
  • Individual physical processes contributing to HHG were identified.
  • The combined effect of these processes significantly enriches and extends the harmonic spectrum.

Conclusions:

  • Theoretical modeling using TD-RASCI provides insights into HHG mechanisms.
  • The interplay of various physical processes is crucial for spectral extension in HHG.
  • This study advances the understanding of HHG in atomic systems under intense laser fields.