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Attosecond electron-spin dynamics in Xe 4d photoionization.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Spectroscopy

Background:

  • Photoionization of xenon atoms exhibits phenomena like giant resonance and complex Auger decay.
  • Previous studies lacked real-time dynamics of these processes.
  • Spin-orbit interaction influences intermediate Xe+ states.

Purpose of the Study:

  • To investigate the real-time dynamics of 4d photoionization in xenon atoms.
  • To differentiate and characterize interfering ionization mechanisms.
  • To understand the interplay of electron and spin dynamics.

Main Methods:

  • Attosecond interferometry combined with coincidence spectroscopy.
  • Time-frequency analysis of ionization transitions.
  • Studying xenon atoms in the 70-100 eV energy range.

Main Results:

  • Identified two interfering ionization mechanisms: a fast-decaying giant dipole resonance (<50 attoseconds) and a slow-decaying spin-flip resonance (hundreds of attoseconds).
  • Observed distinct decay times for different resonance pathways.
  • Provided insights into the temporal evolution of electron-electron and electron-spin interactions.

Conclusions:

  • The study elucidates the complex temporal dynamics of xenon photoionization.
  • Attosecond interferometry reveals distinct timescales for different ionization pathways.
  • Results advance the understanding of electron-spin dynamics in photo-induced atomic processes.