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Fluorescence Time Delay in Multistep Auger Decay as an Internal Clock.

S Kosugi1,2, F Koike1, M Iizawa1,2

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Postcollision interaction (PCI) effects on Krypton (Kr) Auger electron spectra differ based on initial photoionization. Time delays from fluorescence alter Auger peak shifts and energy tails, acting as an internal clock.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Spectroscopy

Background:

  • Postcollision interaction (PCI) influences atomic electron spectra following photoionization.
  • Krypton (Kr) L-shell photoionization exhibits complex Auger electron spectra.
  • Multistep ionization processes introduce time delays affecting atomic dynamics.

Purpose of the Study:

  • To investigate the impact of different photoionization pathways on Kr L3M4,5M4,5 Auger electron spectra.
  • To analyze the role of fluorescence-induced time delays in PCI effects.
  • To compare experimental observations with time-dependent theoretical models for PCI.

Main Methods:

  • Experimental measurement of Kr L3M4,5M4,5 Auger electron spectra.
  • Photoionization of Kr slightly above the K and L3 thresholds.
  • Application of time-dependent theory for postcollision interaction in multistep processes.

Main Results:

  • Observed distinct PCI effects on Kr Auger spectra depending on initial photoionization threshold (K vs. L3).
  • Identified fluorescence emission as a key factor causing time delays.
  • Demonstrated reduced Auger peak shifts and low-energy tailing due to delayed Auger decay.
  • Time-dependent PCI theory accurately reproduced experimental findings.

Conclusions:

  • PCI effects are sensitive to the temporal sequence of ionization and decay processes.
  • Fluorescence-induced time delays significantly modify Auger electron spectra.
  • The observed phenomena can be explained by an internal clock mechanism within the time-dependent PCI theory.