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Molecular alignment dependent electron interference in attosecond ultraviolet photoionization.

Kai-Jun Yuan1, André D Bandrauk1

  • 1Laboratoire de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke , Sherbrooke, Québec J1K 2R1, Canada.

Structural Dynamics (Melville, N.Y.)
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Molecular photoionization using intense attosecond ultraviolet laser pulses reveals alignment-dependent interference. Minima in photoelectron spectra arise from two-center interference, influenced by molecular orientation and nuclear asymmetry.

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Area of Science:

  • Quantum mechanics
  • Attosecond physics
  • Molecular dynamics

Background:

  • Molecular photoionization is a fundamental process in atomic and molecular physics.
  • Understanding electron emission dynamics is crucial for various applications, including attosecond science.
  • Previous studies have explored photoionization but often lack detailed insights into alignment-dependent effects.

Purpose of the Study:

  • To investigate molecular photoionization processes using intense attosecond ultraviolet laser pulses.
  • To explore the influence of molecular alignment on photoelectron energy spectra.
  • To understand the role of two-center interference and spatial orientation asymmetry.

Main Methods:

  • Numerical solutions of time-dependent Schrödinger equations were employed.
  • Simulations were performed on a single-electron diatomic molecule model.
  • Analysis focused on photoelectron energy spectra and kinetic energies.

Main Results:

  • Minima were observed in molecular photoelectron energy spectra.
  • These spectral features result from two-center interference effects.
  • The observed interference patterns exhibit strong dependence on molecular alignment.
  • Spatial orientation asymmetry of the photoionization process from the two nuclei was identified as a key factor.

Conclusions:

  • Molecular alignment critically influences photoionization dynamics and photoelectron spectra.
  • Two-center interference effects are significant in intense-field molecular photoionization.
  • The asymmetry in photoionization from diatomic molecules plays a crucial role in shaping electron emission patterns.