Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 31: Interaction with strong or short laser pulses IV
A 31.4: Vortrag
Donnerstag, 15. März 2012, 11:30–11:45, V57.05
Time-resolved nanoplasma dynamics in single xenon clusters driven by intense XUV and NIR pulses — •L. Flückiger1, M. Adolph1, T. Gorkhover1, D. Rupp1, M. Sauppe1, S. Schorb2, S. Düsterer3, M. Harmand3, H. Redlin3, R. Treusch3, C. Bostedt2, M. Krikunova1, and T. Möller1 — 1Technische Universität, Berlin — 2LCLS, SLAC National Accelerator Laboratory — 3Deutsches Elektronen-Synchrotron, Hamburg
We performed first two-colour pump-probe experiments on individual free xenon clusters at FLASH. New insight into the timescales of ionization dynamics, thermalization and fragmentation was achieved by simultaneous measurements of scattering patterns and ion time-of-flight spectra. Both, intense NIR and XUV pulses can highly ionize clusters and create a nanoplasma. However, only the radiation field of a NIR pulse couples strongly to the quasi-free electrons within the cluster. Therefore, the dynamics depend on the relative timing of the pulses.
With NIR as pump and FEL as probe pulse we follow the cluster fragmentation in real time by taking snapshots of the disintegrating sample while ion spectra provide information about the degree of cluster ionization. By reversing the temporal order of the beams, resonance conditions are reached - where the laser frequency corresponds to the plasma frequency - resulting in an enhanced energy absorption. A clear time and cluster size dependent signature was revealed by the charge state distribution and the flourescence yield detected.