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Electron correlation significantly impacts photoemission time, challenging the one-electron view of the photoelectric effect. This study resolves inconsistencies by analyzing argon

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Photoelectron Spectroscopy

Background:

  • The photoelectric effect is often simplified as a one-electron process.
  • Electron correlation, the interaction between electrons, is crucial in multielectron systems.
  • Previous theories and experiments showed inconsistencies in photoionization dynamics.

Purpose of the Study:

  • Investigate electron correlation's role in attosecond photoionization of argon.
  • Resolve discrepancies between theoretical predictions and experimental results for photoemission time delays.
  • Unravel the atomic potential and dynamics experienced by photoemitted electrons.

Main Methods:

  • High-spectral resolution attosecond interferometry experiments.
  • Novel theoretical calculations.
  • Analysis of argon's outer s subshell photoionization near its cross-section minimum.

Main Results:

  • Identified key electron correlations influencing photoemission time.
  • Resolved long-standing inconsistencies between measurements and theories.
  • Demonstrated contributions from coherent couplings with shakeup channels.

Conclusions:

  • Electron correlation is essential for accurately describing photoionization dynamics.
  • Attosecond interferometry provides unprecedented insight into electron-electron interactions.
  • This work advances the understanding of electron dynamics within atoms.