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Time resolved Fano resonances.

Marlene Wickenhauser1, Joachim Burgdörfer, Ferenc Krausz

  • 1Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna, Austria.

Physical Review Letters
|February 9, 2005
PubMed
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Researchers observed the buildup of Fano resonance using attosecond streaking, mapping electron wave packet evolution in atoms. This technique shows promise for studying ultrafast electronic dynamics, particularly (super-)Coster-Kronig transitions.

Area of Science:

  • Atomic Physics
  • Quantum Dynamics
  • Ultrafast Spectroscopy

Background:

  • Recent advances in attosecond pulse generation and metrology enable probing ultrafast electronic dynamics.
  • Pump-probe experiments allow for the investigation of time-dependent quantum phenomena in atoms.

Purpose of the Study:

  • To investigate the feasibility of observing Fano resonance buildup in the time domain.
  • To utilize attosecond streaking techniques for time-resolved measurements of electronic wave packets.

Main Methods:

  • Initialization of a time-resolved resonance using sub-femtosecond extreme ultraviolet (XUV) pump pulses.
  • Employment of synchronized, phase-controlled probe laser pulses for attosecond streaking.
  • Mapping the time evolution of the coherent superposition of resonant states and continuum onto electron spectra.

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Main Results:

  • Demonstrated the capability to observe the dynamic evolution of Fano resonance.
  • Electron spectrum modulation as a function of pump-probe time delay reveals resonance buildup.
  • (Super-)Coster-Kronig transitions with lifetimes around 400 attoseconds are identified as suitable candidates.

Conclusions:

  • Attosecond streaking is a viable technique for time-domain observation of Fano resonance.
  • This method provides insights into the ultrafast dynamics of electronic wave packets.
  • The study highlights the potential for investigating short-lived atomic transitions.