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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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High-Harmonic Generation Enhanced by Dynamical Electron Correlation.

Iliya Tikhomirov1, Takeshi Sato1,2, Kenichi L Ishikawa1,2

  • 1Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

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This summary is machine-generated.

We discovered new multielectron effects in high-harmonic generation (HHG) using simulations. These effects, driven by electron correlation, reveal phenomena beyond the typical single-electron model.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Computational Chemistry

Background:

  • High-harmonic generation (HHG) is typically modeled as a single-electron process.
  • Understanding multielectron dynamics is crucial for advanced light-matter interactions.
  • Electron correlation effects in intense laser fields remain challenging to study.

Purpose of the Study:

  • To theoretically investigate multielectron effects in high-harmonic generation (HHG).
  • To explore phenomena beyond the standard single-electron HHG model.
  • To identify new avenues for studying electron correlation in atomic systems.

Main Methods:

  • All-electron first-principles simulations.
  • Utilizing a one-dimensional model atom.
  • Analyzing the response of atomic systems to intense laser fields.

Main Results:

  • Observed a prominent resonance peak and a second plateau in HHG spectra, extending beyond the typical cutoff.
  • These features arise from the dication response, significantly enhanced by the Coulomb force of a rescattering electron.
  • Demonstrated a clear manifestation of electron correlation in the HHG process.

Conclusions:

  • The observed phenomena highlight the significant role of electron correlation in HHG.
  • The underlying physical mechanism is expected to be relevant for three-dimensional atomic systems.
  • HHG can serve as a powerful tool to probe dynamical electron correlation, challenging its usual single-electron description.