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A: Fachverband Atomphysik

A 22: Poster II - Atomic clusters

A 22.12: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster B

Inner Shell Photoelectron Spectroscopy using VUV-FEL Radiation of Mass-Selected Pb-Clusters: A Single Shot Analysis — •Tim Fischer¹, Volkmar Senz², Patrice Oelßner², John Neville³, Markus Schöffler⁴, Jörg Stanzel⁵, Heiko Thomas⁶, Matthias Neeb⁵, Josef Tiggesbäumker², Michael Martins⁷, Eckart Rühl⁸, Christoph Bostedt⁶, Wolfgang Eberhardt⁵, Gerd Ganteför¹, Thomas Möller⁶, Horst Schmidt-Böcking⁴, Reinhard Dörner⁴, Wilfried Wurth⁷, and Karl-Heinz Meiwes-Broer² — ¹Universität Konstanz — ²Universität Rostock — ³University of New Brunswick, Canada — ⁴Universität Frankfurt am Main — ⁵BESSY Berlin — ⁶Technische Universität Berlin — ⁷Universität Hamburg — ⁸Freie Universität Berlin

For clusters the catalytic, chemical and magnetic properties depend strongly on the number of atoms. VUV photoelectron spectroscopy provides a powerfull access to these electronical and geometrical set of problems. Currently, no light source is suitable to measure the entire valence and shallow core levels, except the free-electron-laser FLASH at HASYLAB/DESY. It provides the appropriate radiation of several tens of eV with sufficient high photon flux, but with shot-per-shot fluctuation up to a factor of 10. Furthermore the FEL multibunch structure allows to investigate more than one cluster size per shot.

For measuring the clusters, a resolution and pressure optimised UHV-build up with fast data acquisition were used. Electron time-of-flight data, photon flux and cluster intensity were accumulated for every single shot via ROOT and enables laser intensity related analysis.