Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 14: Interaction with VUV and X-ray light II

A 14.5: Vortrag

Dienstag, 13. März 2012, 11:30–11:45, V57.05

Autoionization dynamics of H2 and D2 molecules using XUV pulses — •Alexander Sperl, Andreas Fischer, Michael Schönwald, Helga Rietz, Philipp Cörlin, Arne Senftleben, Thomas Pfeifer, Robert Moshammer, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Heidelberg

Wave packet dynamics in molecules are studied by combining an XUV pulse source together with a Reaction Microscope detection system, which allows for coincident measurements of ions and electrons. Furthermore, it is capable of measuring the three dimensional momentum of each charged particle involved in the ionization process.

We used this technique to study the autoionization of doubly excited H2 and D2 molecules, a process with occurs on a timescale of a few femtoseconds [1]. Since this reaction time is of the order of the molecular motion, the nuclei can no longer be regarded stationary. The coupling of the dissociation dynamics of H2+ and D2+ to the corresponding electron, which is ionized through the autoionization channel, leads to a symmetry breaking in the dissociation. In order to study the temporal dynamics of these processes we probed the molecules with XUV pulses of different durations.

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