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The photoionization dynamics based on molecular pre-orientation.

Meng-Lin Zhou1, Jie Yu1, Gao-Ren Wang1

  • 1School of Physics, Dalian University of Technology, Dalian 116024, China.

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|January 28, 2019
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Summary

We theoretically explored how laser pulses orient the NaK molecule for photoionization. Stronger orientation increases ionization probability and sharpens photoelectron distributions, offering control over molecular dynamics.

Keywords:
Angle-resolved photoelectron spectrumIonization probabilityPADPre-orientationPump-probe photoionization

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Area of Science:

  • Quantum Chemistry
  • Molecular Physics
  • Laser Spectroscopy

Background:

  • Controlling molecular orientation is crucial for understanding and manipulating chemical reactions.
  • Photoionization provides insights into molecular electronic structure and dynamics.

Purpose of the Study:

  • To theoretically investigate the photoionization dynamics of laser-oriented Sodium-Potassium (NaK) molecules.
  • To analyze the impact of molecular orientation degree and duration on ionization outcomes.

Main Methods:

  • Theoretical modeling of photoionization processes.
  • Utilizing Terahertz (THz) laser pulses for ground-state molecular orientation.
  • Employing pump-probe laser pulses for molecular excitation and ionization.

Main Results:

  • Stable ionization signals and photoelectron angular distributions (PAD) are achieved during molecular orientation.
  • Increased molecular orientation degree enhances ionization probability and concentrates photoelectron signals.
  • Observed splitting patterns in angle-resolved photoelectron spectra provide further dynamic information.

Conclusions:

  • Laser-induced molecular orientation offers a powerful method to control photoionization dynamics.
  • Precise control over orientation parameters allows for optimization of ionization signals and photoelectron distributions.
  • The study highlights the potential for tailored molecular interactions using controlled orientation.