Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 5: Experimental Techniques
MO 5.1: Vortrag
Montag, 12. März 2012, 16:30–16:45, V38.02
High Energy Velocity Map Imaging for Experiments at FEL — •Axel Hundertmark1,2, Arnaud Rouzée1,2, Per Johnsson3, and MarcJ.J. Vrakking1,2 — 1Max-Born-Institut, Max-Born Straße 2A, D-12489 Berlin, Germany — 2FOM Institute AMOLF, NL-1098 XG Amsterdam, Netherlands — 3Department of Physics, Lund University, Post Office Box 118, SE-22100 Lund, Sweden
Free Electron Lasers (FEL) offers high photon flux in the VUV/X-ray regime with fs pulse duration. Such conditions give the opportunity to study multi-photon multiple ionization of atoms or molecules in this photon range and in combination with a time delayed laser allow to carry out pump-probe experiments. We present preliminary results obtained at the Linac Coherent Light Source (LCLS) and Free-electron Laser in Hamburg (FLASH) on the multi-photon ionization of rare gas atoms, the ionization dynamics of Br2 molecule and on the molecular alignment of CO2 molecules induced by a first laser excitation. The measurements were done with a newly developed high energy Velocity Map Imaging spectrometer (VMIs) which records the photoelectron angular distribution over an energy range that can extant to 1.5 keV.