Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Poster I
A 8.44: Poster
Dienstag, 9. März 2010, 16:30–19:00, Lichthof
Velocity Map Imaging of Xe Clusters Irradiated with FEL Raditation — •Sebastian Schorb1, Rainer Unterumsberger1, Daniela Rupp1, Tais Gorkhover1, Benjamin Röben1, Tobias Zimmermann1, Thomas Möller1, Per Johnsson2, Marc Vrakking3, and Christoph Bostedt4 — 1Institut für Optik und Atomare Physik, Technische Universität Berlin — 2Department of Physics, Lund University — 3FOM Institut AMOLF — 4Linac Coherent Light Source, SLAC
For many potential experiments with free electron lasers it is of fundamental importance to study how the absorption and ionization properties of nanoscaled systems develop in the short wavelength -- strong field domain. We performed first single-shot ion velocity map imaging (VMI) experiments on Xe clusters at the FLASH FEL at DESY in Hamburg. The Xe was resonantly excited at the 4d core level with power densities up to 1014 W/cm2. A special velocity map imaging spectrometer configuration was used to detect charged fragments with kinetic energies up to 600 eV per charge. By pulsing the detector, the kinetic energy distribution of different species and charge states could be investigated separately. With a piezo driven skimmer the density of the cluster beam could be reduced to a single cluster in the focal volume. The images show an isotropic spatial ion distribution and kinetic energy distribution changing with the charge state. This could be interpreted as an indication for a shell by shell explosion of the clusters. The data is discussed and compared to theoretical predictions and experimental results.