Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Poster II

A 34.41: Poster

Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster

Velocity Map Imaging of Xe-Clusters Irradiated with FEL-Radiation — •Sebastian Schorb¹, Rainer Unterumsberger¹, Per Johnsson², Heiko Thomas¹, Marc Vrakking², Thomas Möller¹, and Christoph Bostedt¹ — ¹Institut für Optik und Atomare Physik, Technische Universität Berlin — ²FOM - AMOLF, Amsterdam

We performed first single-shot ion velocity map imaging (VMI) experiments on Xe clusters at the FLASH FEL at HASYLAB in Hamburg. 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 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. 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 recent theoretical predictions.