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Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 12: Atomic Clusters I

A 12.1: Invited Talk

Wednesday, March 10, 2010, 14:00–14:30, F 303

Sequential two-photon double ionization of atoms in intense FEL radiation — •Stephan Fritzsche1,2, Alexei N. Grum-Grzhimailo3, Elena V. Gryzlova3, and Nikolay M. Kabachnik31Department of Physics, University of Oulu, Finland — 2GSI Helmholtzzentrum für Schwerionenforschung, Germany — 3Institute of Nuclear Physics, Moscow State University, Russia

Recent progress in the generation of intense FEL radiation has opened a new avenue for studying non-linear processes of atoms and molecules in the XUV and x-ray regime. Among these processes, the two-photon double ionization (TPDI) has received much interest since it enables one to explore in detail the transition from a ‘sequential’ towards the ‘simultaneous’ emission of two or more electrons. In this talk, I shall discuss this process for different noble gases and for its parametrization in terms of the alignment and dynamical behaviour of the photoions in their intermediate and final states. Results from different computational models [1] are presented and compared with recent experiments [2,3]. Apart from modifications on the (individually) observed photo-electron distributions due to multi-photon absorption, emphasis is placed also on the electron-electron correlation (function) if the two photo-electrons are detected in coincidence.
S. Fritzsche et al., J. Phys. B 41 (2008) 165601; B 42 (2009) 145602.
M. Braune et al., Intern. Conf. on Photonic, Electronic and Atomic Collisions (ICPEAC 2007), Freiburg, Germany, Abstract Fr034.
M. Kurka et al., J. Phys. B 42 (2009) 141002(FT).

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