München 2004 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 5: Ultrakurze Lichtimpulse: Attosekundenpulse
Q 5.2: Vortrag
Montag, 22. März 2004, 14:30–14:45, HS 223
Time Resolved Autoionization — •M. Wickenhauser1, J. Burgdoerfer1, F. Krausz2, and M. Drescher3 — 1Inst. for Theoretical Physics, Vienna University of Technology — 2Photonics Inst., Vienna University of Technology — 3Faculty of Physics, University of Bielefeld
Recent experiments have succeded in tracing the time evolution of an Auger
decay with a decay time of 8 fs with attosecond resolution. We investigate
the feasibility to implement the same pump probe technique to study
time-resolved autoionization. A time-resolved autoionization process is
initialized by a short XUV-pump pulse (ℏ ω∼ 50−100 eV) in the
presence of a synchronized probe laser pulse (ℏ ω∼ 1.6 eV).
Excitation with the pump pulse opens two interfering paths from the ground
state to the continuum. The time evolution of the coherent superposition of
resonant state and continuum is mapped onto a modulation of the electron
spectrum as a function of the time delay between pump and probe pulse.
Without probe laser the spectrum shows the typical Beutler-Fano profile. In
the presence of the probe pulse periodical fluctuations and sidebands in
the energy spectrum provide information about the time evolution of the
autoionization process. Furthermore we have found that in the case of
complex Fanoparameters time-resolved experiments provide more information
than time-integral measurements. Possible candidates to test our
predictions are (Super-) Coster Kronig transitions with lifetimes of the
order of 500 as. This method holds the promise to resolve complex atomic
dynamics on the attosecond scale.
Work supported by the Austrian FWF, proj. No. SFB016.