Berlin 2012 – scientific programme

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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 35.130: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster B

High-Resolution Double-Photoelectron Spectroscopy from superconducting Surfaces — •Tobias Bauer, Robert Wallauer, Stefan Voss, and Reinhard Dörner — Institut für Kernphysik, Goethe Universität, 60486 Frankfurt am Main, Germany

It is theoretically predicted that the breakup of Cooperpairs by a single XUV photon leads to the emission of two electrons which formed the pair. First experiments which have been performed with a custom-build Time-of-Flight spectrometer, failed to show evidence for this process due to the low energy resolution.

With a new developed experimental setup which includes a new spectrometer (THEMIS1000 with an Wide Angle Lens - SPECS) and an especially for coincident measurements designed time- and position-sensitive detector (HEX90 - RoentDek), we will be able to measure coincident electrons with +/- 30° emission angle and a resolution comparable to state of the art hemispherical analyzers. The data analysis plays a crucial role in the experiment, since the electrons are expected to hit the detector at the same time. We present the results of a new method for pulse analysis and other experimental improvements in order to achieve nearly dead-time free detection efficiency.