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O: Fachverband Oberflächenphysik

O 109: Tribology and Structure of Surfaces: Misc.

O 109.5: Vortrag

Freitag, 24. März 2017, 11:45–12:00, WIL A317

Temperature dependent investigation of Ni layers on Pd with Positron annihilation induced Auger electron spectroscopy, XPS and STM — •Samantha Zimnik, Marcel Dickmann, 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 the topmost atomic layer of a specimen. The positron beam facility NEPOMUC at the research reactor of the Heinz Maier-Leibnitz Zentrum in Garching delivers the world's most intense positron beam and enables measurement times of only a few minutes per PAES spectrum. A new sample holder allows controlling of the sample temperature during the measurement up to 500°C. Thus, time and temperature-dependent PAES have become possible and hence enable 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.