Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 12: Atomic Clusters I
A 12.1: Hauptvortrag
Mittwoch, 10. März 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. Kabachnik3 — 1Department 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).