Düsseldorf 2007 – wissenschaftliches Programm
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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.