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  Schnorr, K.; Senftleben, A.; Kurka, M.; Rudenko, A.; Schmid, G.; Pfeifer, T.; Meyer, K.; Kübel, M.; Kling, M.F.; Jiang, Y.H.; Treusch, R.; Düsterer, S.; Siemer, B.; Wöstmann, M.; Zacharias, H.; Mitzner, R.; Zouros, T.J.M.; Ullrich, J.; Schröter, C.D.; Moshammer, R.: Electron Rearrangement Dynamics in Dissociating I₂ⁿ⁺ Molecules Accessed by Extreme Ultraviolet Pump-Probe Experiments. Physical Review Letters 113 (2014), p. 073001/1-5

10.1103/PhysRevLett.113.073001
Open Access Version

Abstract:
The charge rearrangement in dissociating Inþ 2 molecules is measured as a function of the internuclear distance R using extreme ultraviolet pulses delivered by the free-electron laser in Hamburg. Within an extreme ultraviolet pump-probe scheme, the first pulse initiates dissociation by multiply ionizing I2, and the delayed probe pulse further ionizes one of the two fragments at a given time, thus triggering charge rearrangement at a well-defined R. The electron transfer between the fragments is monitored by analyzing the delay-dependent ion kinetic energies and charge states. The experimental results are in very good agreement with predictions of the classical over-the-barrier model demonstrating its validity in a thus far unexplored quasimolecular regime relevant for free-electron laser, plasma, and chemistry applications.