Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 37: Atomic clusters

A 37.4: Vortrag

Donnerstag, 15. März 2012, 15:15–15:30, V57.05

Core-level photoelectron spectroscopy on free mass-selected Gold clusters at the free-electron laser FLASH — •Patrice Oelßner¹, Jens Bahn¹, Michael Köther¹, Christian Braun², Volkmar Senz¹, Steffen Palutke³, Michael Martins³, Gerd Ganteför², Bernd von Issendorff⁴, Josef Tiggesbäumker¹, and Karl-Heinz Meiwes-Broer¹ — ¹IfPh, Uni-Rostock — ²FB Physik, Uni-Konstanz — ³IfExp. Physik, Uni Hamburg — ⁴Fak. f. Physik, Uni Freiburg

A promising method to investigate the electronic structure of clusters is core-level photoelectron spectroscopy as used extensively in surface science [Phys. Rev. Lett. 102, 138303 (2009)]. The VUV free electron laser FLASH at DESY delivers intense light with a wavelength down to 4.8 nm (258 eV) to allow such studies. With a hemispherical analyzer equipped with a Delay-Line-Detector we studied core-level-binding energies. Results on mass-selected gold clusters anions from 45 to 150 atoms show a size-dependent 4f core-level shift as predicted by the metal sphere model [Phys. Rev. B 50,5744 (1994)]. By measuring the gold 4f binding energies of anions and cations as a function of cluster-size one can calculate, e.g. the chemical potential.