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We measured attosecond time delays for single-photon ionization in argon and neon atoms. Our findings reveal energy-dependent delays and resonance structures, advancing our understanding of electron behavior during ionization.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Attosecond Science

Background:

  • Understanding electron dynamics during photoionization is crucial in atomic physics.
  • Previous studies often focused on tunneling ionization, leaving single-photon ionization less explored in terms of precise time delays.
  • The Wigner time delay framework provides a theoretical basis for analyzing ionization processes.

Purpose of the Study:

  • To precisely measure energy-dependent single-photon ionization time delays for argon and neon.
  • To investigate the role of resonance structures in these time delays.
  • To compare experimental results with theoretical calculations, including Wigner time delays and multiconfigurational Hartree-Fock methods.

Main Methods:

  • Utilized a coincidence detection technique for simultaneous measurement of argon and neon.
  • Employed high-resolution spectroscopy to analyze energy-dependent time delays.
  • Performed multiconfigurational Hartree-Fock calculations incorporating doubly excited states and ionization thresholds.

Main Results:

  • Measured time delays of a few tens of attoseconds for outermost valence electrons in argon and neon.
  • Observed energy-dependent time delays with high energy resolution.
  • Identified resonance features at specific photon energies, which were qualitatively reproduced by theoretical calculations.

Conclusions:

  • Experimental data aligns with the general trend predicted by Wigner time delay calculations for single-photon ionization.
  • Observed resonance features highlight the importance of electron-electron correlation and atomic structure in ionization dynamics.
  • The study provides crucial experimental benchmarks for validating theoretical models of attosecond electron dynamics.