Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Interaction with VUV and X-ray light I
A 11.6: Vortrag
Montag, 12. März 2012, 18:15–18:30, V47.03
Terahertz streaking reveals chirped Auger electron emission — •Bernd Schütte1,3, Sebastian Bauch2, Ulrike Frühling1, Marek Wieland1, Michael Gensch4,5, Elke Plönjes4, Thomas Gaumnitz1, Armin Azima1, Michael Bonitz2, and Markus Drescher1 — 1Universität Hamburg — 2Christian-Albrechts-Universität, Kiel — 3Max-Born-Institut, Berlin — 4Deutsches Elektronen-Synchrotron DESY, Hamburg — 5Helmholtz-Zentrum Dresden Rossendorf
We have investigated the Auger decay in xenon and krypton atoms in the presence of a strong terahertz field. The experiments were performed at two different light sources, namely the free-electron laser in Hamburg (FLASH) and a source of high-order harmonic generation (HHG). By measuring at different phases of the terahertz streaking field and from different observation directions, a time-dependent energetic chirp of the Auger electrons was observed. The origin of this behavior was found to be an energy transfer between the Auger electron and the earlier emitted photoelectron in the laser field. This interaction alters the Auger electron energy depending on its emission time with respect to the photoelectron. The experimentally obtained data agree well with theoretical calculations, thereby facilitating the proposed model. Thus, terahertz streaking proves to be an excellent tool for recording electron dynamics in the femtosecond range.