Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Poster I
A 8.6: Poster
Dienstag, 9. März 2010, 16:30–19:00, Lichthof
Core-level Photoelectron Spectroscopy on Free Mass-Selected Metal Clusters at FLASH — •V. Senz1, T. Fischer2, P. Oelßner1, J. Bahn1, A. Kickermann1, M. Köther1, J. Neville3, M. Schöffler4, L. Foucar4, H. Thomas5, S. Schorb5, M. Neeb6, J. Tiggesbäumker1, M. Martins7, E. Rühl8, C. Bostedt5, W. Eberhardt6, M. Götz2, G. Ganteför2, T. Möller5, H. Schmidt-Böcking4, R. Dörner4, W. Wurth7, and K.-H. Meiwes-Broer1 — 1I. f. Physik, U Rostock — 2FB Physik, U Konstanz — 3University of New Brunswick, Canada — 4I. f. Kernphysik, U Frankfurt — 5I. f. Optik und Atomare Physik, TU Berlin — 6Helmholtz-Zentrum Berlin — 7I. f. Experimentalphysik, U Hamburg — 8Phys. u. Theor. Chemie, FU Berlin
The electronic structure forms the basis for understanding and tailoring the physical and chemical properties of clusters. A promising method to study this issue is core-level photoelectron spectroscopy using the VUV free-electron laser FLASH at DESY. Our results on lead clusters feature a size-dependent 5d core-level shift and reveal a remarkable change of final state screening conditions due to a metal-to-nonmetal transition at a cluster size of 20 atoms. The interplay of geometry, bonding character and final state electron relaxation and screening of these finite size systems could be experimentally accessed and may challenge theoretical treatment [Phys. Rev. Lett. 102, 138303 (2009)]. In addition, first results on Au 4f spectroscopy will be discussed. A new experimental setup using a hemispherical electron spectrometer leading to improved energy resolution will be presented.