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 35.83: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Towards time- and angle-resolved photoemission at a free-electron laser with an angle-resolving ToF spectrometer — •Christian Sohrt¹, Michael Bauer¹, Wilfried Wurth², Lutz Kipp¹, and Kai Rossnagel¹ — ¹Institut f\"ur Experimentelle und Angewandte Physik, Kiel, Germany — ²Institut f\"ur Experimentalphysik and Center for Free-Electron Laser Science, Hamburg, Germany

The Free-Electron Laser (FEL) in Hamburg (FLASH) generates highly brilliant, ultrashort pulsed radiation with pulse durations down to 50 fs and photon energies up to 1000 eV. This enables unique experiments, as for example time-resolved core-level photoelectron spectroscopy. However, to establish photoelectron spectroscopy as a completely viable technique at an FEL, one has to develop a detection scheme with maximum efficiency, because the pulse repetition rates of FELs are notoriously low and the available beam time is extremely scarce. Our proposed solution is a photoelectron spectroscopy experiment based on a novel angle-resolved time-of-flight spectrometer. Compared to traditional detection schemes the instrument is expected to enhance the detection efficiency by a factor of about 200--due to the larger acceptance angle--and the temporal resolution by a factor of seven to about 100 fs--due to single-pulse detection. Thus, it will become possible to correlate core-level dynamics which is sensitive to changes in the charge distribution around specific atomic sites, with the dynamics of electrons at the Fermi surface in a single experiment. Here we present the progress of this project. This work is supported by the BMBF (FSP 301 FLASH).