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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. Drescher31Inst. 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.

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