Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)

O 58.67: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

Angular and Energy Resolved Measurement of Reemitted Positrons from W, Pt and Ni Single Crystals — •Florian Lippert¹, Samantha Zimnik¹, Hubert Ceeh¹, Christian Piochacz², and Christoph Hugenschmidt^1,2 — ¹TU München, Physik Department, Lehrstuhl E21, James-Franck-Str. 1, 85748 Garching — ²TU München, FRM II, Lichtenbergstr. 1, 85748 Garching

Monoenergetic positron beams are applied for a variety of non-destructive experiments in surface- and solid state physics. In order to create monoenergetic positrons, so called (re-)moderating materials with negative positron work functions are used, such as W, Pt and Ni. After thermalisation and diffusion to the surface, moderated positrons leave the solid with an energy according to the absolute value of the positron work function. In this work the angular distribution of reemitted positrons from W(100), W(110), Pt(100), Pt(110), Ni(100) and Ni(110) is being measured. In addition, low-temperature measurements are performed to study the thermal spread. Financial support within the project no. 05KI0WOB by the BMBF is gratefully acknowledged.