Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.71: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Twin-Photoemission Electron Microscopy System (Twin-PEEM) — •Alexander Krasyuk1, Christian Tusche1, Gerd Schönhense2, and Jurgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — 2Johannes Gutenberg Universität Mainz, Staudinger Weg 7, D-55128 Mainz, Germany
We will present an innovative twin photoemission electron microscopy system (Twin-PEEM), which consists of two fully functionally crossed PEEMs. The Twin-PEEM was calculated with commercial software to design charged particle optics devices and constructed using professional 3D CAD software. The new design allows to place a single crystalline target directly after the cathode lens of the microscope in such a way that the low energy electrons diffracted on the single crystal can be imaged in a 90° mirror-like geometry. As was recently shown [1,2] such electron mirror can be used as a highly efficient spin-filter for 2D PEEM images. We characterize a few micro-structured samples obtained with Twin-PEEM using unpolarised deep ultraviolet light (discharge lamp) with the aim to demonstrate the potential of the novel electron microscope. We will discuss also the possibility of using the Twin-PEEM as tool for spin-resolved photoemission experiment.
[1] C. Tusche, M. Ellguth, A. A. Ünal, C.-T. Chiang, A. Winkelmann, A. Krasyuk, M. Hahn, G. Schönhense, and J. Kirschner, APL 99, 032505 (2011)
[2] M. Kolbe, P. Lushchyk, B. Petereit, H.J. Elmers, G. Schönhense, A. Oelsner, C. Tusche, and J. Kirschner. PRL 107, 207601 (2011)