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Updated: Jun 16, 2025

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Orientation-resolved Cooper-like minimum in high-order harmonic spectrum from asymmetric molecules
We observed an orientation-resolved Cooper-like minimum in high-order harmonic generation (HHG) from asymmetric CO molecules. This minimum, influenced by molecular orientation, offers insights into electron dynamics in asymmetric systems.
Area of Science:
- Quantum Optics
- Molecular Physics
- Computational Chemistry
Background:
- High-order harmonic generation (HHG) is a key process in strong-field physics.
- Understanding electron dynamics in asymmetric molecules is crucial for controlling HHG.
- Cooper-like minima provide insights into molecular orbital contributions.
Purpose of the Study:
- To investigate the orientation-resolved Cooper-like minimum in HHG from asymmetric CO molecules.
- To explore the influence of molecular orientation on the harmonic spectrum.
- To provide experimental guidance for observing Cooper-like minima in asymmetric systems.
Main Methods:
- Time-dependent density functional theory (TD-DFT) calculations.
- Simulation of HHG spectra under linearly polarized laser fields.
- Analysis of harmonic spectra as a function of molecular orientation.
Main Results:
- An orientation-resolved Cooper-like minimum was observed in the HHG spectrum of CO.
- When the molecular axis is perpendicular to the laser polarization, a minimum appears in even harmonics.
- When the molecular axis is parallel to the laser polarization, a minimum appears in odd harmonics, shifting with pulse parameters.
Conclusions:
- The study confirms the existence of Cooper-like minima in asymmetric molecules.
- Molecular orientation significantly impacts the characteristics of the Cooper-like minimum.
- The findings suggest specific experimental conditions for observing Cooper-like minima in asymmetric molecules.
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