Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 24: Poster: Interaction with VUV and X-ray light

A 24.11: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.V

Autoionization of D2 molecules using ultra-short XUV pulses — •Andreas Fischer, Alexander Sperl, Michael Schönwald, Helga Rietz, Philipp Cörlin, Arne Senftleben, Thomas Pfeifer, Robert Moshammer, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Heidelberg

Wave packet dynamics of molecules can be studied by combining an XUV pulse source and a Reaction Microscope. A Reaction Microscope allows for coincident measurements of ions and electrons. Further more it is capable of measuring the three dimensional momentum of each charged particle created in a reaction. We used this to study the autoionization of doubly-excited D2 molecules. The coupling with the dissociative photoionization channels leads to a symmetry breaking in the observed electron and ion angular distributions. Autoionizations occur on the same time scale as the molecular motion, therefore the nuclei can no longer be regarded stationary. In order to study these processes we probed the molecules with XUV pulse trains with photon energies of up to 32eV. We also modified the duration of the XUV pulse trains by changing the duration of the generating infrared pulses [1].

[1] J. Fernandez, F. Martin, New J Phys 11, 043020 (2009)