Speaker
Kirsten Schnorr
(Max-Planck-Institut für Kernphysik)
Description
We use an XUV-pump--XUV-probe scheme to access electron rearrangement dynamics in dissociating molecular iodine ions. A first pulse of 87 eV, delivered by the free-electron laser FLASH, multiply ionizes and consequently fragments the iodine molecules (I$_2$). Depending on its delay with respect to the pump pulse, the identical probe pulse induces electron transfer between the dissociating ions, which results in symmetrically charged fragments. In contrast, for large delays electron transfer is blocked and we observe asymmetrically charged ion pairs. By means of a reaction microscope we record the yield of coincident ion pairs from dissociating I$_2^{n+}$ molecular ions as a function of the time delay. This allows to determine the critical internuclear distances and corresponding time scales up to which electrons transfer is possible for various molecular break-up channels. Our results are in very good agreement with predictions of a classical over-the-barrier model demonstrating its validity in an energy regime relevant for FEL, plasma and chemistry applications.
Primary author
Kirsten Schnorr
(Max-Planck-Institut für Kernphysik)
Co-authors
Arne Senftleben
(Universität Kassel)
Artem Rudenko
(Kansas State University)
Björn Siemer
(Universität Münster)
Claus-Dieter Schröter
(Max-Planck-Institut für Kernphysik)
Georg Schmid
(Max-Planck-Institut für Kernphysik)
Helmut Zacharias
(Universität Münster)
Joachim Ullrich
(PTB)
Kristina Meyer
(Max-Planck-Institut für Kerphysik)
Matthias Kling
(Max-Planck-Institut für Quantenoptik)
Matthias Kübel
(Max-Planck-Institut für Quantenoptik)
Michael Wöstmann
(Universität Münster)
Moritz Kurka
(Max-Planck-Institut für Kernphysik)
Robert Moshammer
(Max-Planck-Institut für Kernphysik)
Rolf Mitzner
(Bessy)
Rolf Treusch
(DESY)
Stefan Düsterer
(DESY)
Thomas Pfeifer
(Max-Planck-Institut für Kernphysik)
Yuhai Jiang
(Shanghai Advanced Research Institute)
