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Related Experiment Videos

Time-resolved Auger decay in CsBr using high harmonics.

Toshihiko Shimizu1, Taro Sekikawa, Teruto Kanai

  • 1Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan.

Physical Review Letters
|August 9, 2003
PubMed
Summary

The study reveals temperature-driven changes in CsBr

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Area of Science:

  • Solid-state physics
  • Materials science

Background:

  • Inner-shell holes in CsBr exhibit temperature-dependent decay dynamics.
  • Understanding these dynamics is crucial for predicting material behavior under varying thermal conditions.

Purpose of the Study:

  • To investigate the temperature-dependent decay mechanisms of inner-shell holes in CsBr.
  • To determine the lifetimes associated with radiative recombination and Auger decay processes.

Main Methods:

  • Utilized high harmonics to probe the decay dynamics.
  • Measured the temperature-dependent lifetimes of inner-shell holes.

Main Results:

  • Observed a significant decrease in lifetime from 1.1 ns at 10 K (radiative recombination) to 1.5 ps at 340 K.
  • Attributed the shorter lifetime at higher temperatures to increased Auger-allowed final state density within the Urbach exciton tail.
  • Extrapolated Auger lifetime at high temperatures suggests fully energy-allowed Auger decay, yielding an interatomic Auger decay lifetime of 2.4+3.8/-1.5 fs.

Conclusions:

  • The decay dynamics of inner-shell holes in CsBr are strongly temperature-dependent.
  • Auger decay becomes dominant at elevated temperatures, significantly shortening the hole lifetime.
  • The findings align with theoretical predictions for similar materials like NaF.

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