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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Published on: October 9, 2012

Zero-Energy Photoelectric Effect.

Sajad Azizi1, Ulf Saalmann1, Jan M Rost1

  • 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany.

Physical Review Letters
|March 28, 2025
PubMed
Summary
This summary is machine-generated.

We predict a novel "zero energy" peak in multiphoton ionization. This effect depends on electron binding energy and laser pulse duration, not laser frequency, suggesting negative ions for experiments.

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Area of Science:

  • Atomic, Molecular, and Optical (AMO) Physics
  • Quantum Optics
  • Chemical Physics

Background:

  • Multiphoton ionization is a fundamental process in atomic and molecular physics.
  • Understanding ionization dynamics under intense laser fields is crucial for various applications.
  • The interplay between laser parameters and electron binding energy governs ionization pathways.

Purpose of the Study:

  • To predict and characterize a near-threshold (zero energy) peak in multiphoton ionization.
  • To identify the key physical parameters influencing this ionization peak.
  • To suggest optimal experimental conditions and targets for observing this phenomenon.

Main Methods:

  • Theoretical modeling of multiphoton ionization dynamics.
  • Analysis of bound-continuum and continuum-continuum dipole transitions.
  • Investigation of the dependence of ionization yield on photon energy, binding energy, and pulse duration.

Main Results:

  • A distinct "zero energy" peak in multiphoton ionization is predicted under specific conditions.
  • The peak position is found to be independent of laser frequency but dependent on binding energy and pulse duration.
  • Stronger bound-continuum transitions compared to continuum-continuum transitions drive this effect.

Conclusions:

  • The predicted zero-energy photoelectric effect offers a new perspective on ionization dynamics.
  • Optimal observation requires laser spectral width comparable to binding energy and a high second ionization potential.
  • Negative ions are proposed as ideal candidates for experimental verification due to their properties.