Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 78: Nanostructures at Surfaces IV: Various Aspects

O 78.6: Talk

Thursday, March 10, 2016, 11:45–12:00, S052

Investigation of thin Ni films on Pd with Positron annihilation induced Auger electron spectroscopy, XPS and STM — •Samantha Zimnik, Christian Piochacz, Sebastian Vohburger, and Christoph Hugenschmidt — Heinz Maier-Leibnitz Zentrum (MLZ) and Physik Department E21, Technische Universität München, Lichtenbergstraße 1, 85748 Garching, Germany

Positron annihilation induced Auger Electron Spectroscopy (PAES) is a powerful technique to gather information about the elemental composition of only the topmost atomic layer of a specimen. The positron beam facility NEPOMUC at the research reactor Heinz Maier-Leibnitz in Garching delivers the world's most intense positron beam and enables measurement times of only a few minutes per PAES spectrum. Thus, time-dependent PAES becomes possible and enables the in-situ observation of the surface segregation process. The surface spectrometer at NEPOMUC uses the complementary techniques PAES, X-ray photoelectron spectroscopy (XPS) and Scanning Tunneling Microscopy (STM) to characterize both, the elemental composition of the surface and its topology. Recent studies on sub-monolayers of Ni on Pd using time- and temperature dependent PAES will be presented. Financial support by the BMBF within the project no. 05K13WO1 is gratefully acknowledged.