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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Published on: August 6, 2018

Nuclear dynamics in polyatomic molecules and high-order harmonic generation.

Serguei Patchkovskii1

  • 1Steacie Institute for Molecular Sciences, NRC Canada, 100 Sussex Drive, Ottawa, Ontario, K1A 0R6 Canada. Serguei.Patchkovskii@nrc.ca

Physical Review Letters
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

Nuclear dynamics in molecular gases significantly impact high-order harmonic generation. This study develops a theory explaining isotope effects and intensity reductions, crucial for understanding molecular light interactions.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Optics
  • Chemical Physics

Background:

  • High-order harmonic generation (HHG) in molecules is a complex process.
  • The nuclear vibrational wave function undergoes rapid changes during HHG.
  • Understanding these dynamics is key to controlling and interpreting HHG spectra.

Purpose of the Study:

  • To develop an analytical theory for short-time autocorrelation functions in HHG.
  • To investigate the influence of nuclear dynamics on HHG in small molecules.
  • To explain observed isotope effects and intensity modulations in molecular HHG.

Main Methods:

  • Derivation of a simple analytical theory for short-time autocorrelation functions.
  • Application of the theory to a test set of 15 small molecules.
  • Analysis of nuclear dynamics effects on harmonic emission intensity and spectra.

Main Results:

  • The theory successfully explains large isotope effects in methane (CH4).
  • Nuclear dynamics were found to reduce emission intensity by over 50% for NO and NO2 at the harmonic cutoff.
  • Autocorrelation functions demonstrated sensitivity to the initial vibrational state, with wave packet structure reflected in harmonic spectra.

Conclusions:

  • Short-time nuclear dynamics play a critical role in high-order harmonic generation.
  • The developed analytical theory provides valuable insights into molecular HHG mechanisms.
  • This work highlights the importance of considering nuclear motion for precise control and interpretation of HHG from molecules.