Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.103: Poster

Tuesday, March 15, 2011, 18:30–22:00, P4

Towards time- and angle-resolved photoemission at a free-electron laser with an angle-resolving ToF spectrometer — Christian Sohrt¹, •Kerstin Hanff¹, Stefan Hellmann¹, Michael Bauer¹, Wilfried Wurth², Lutz Kipp¹, and Kai Rossnagel¹ — ¹Institut für Experimentelle und Angewandte Physik, Kiel, Germany — ²Institut für 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. This work is supported by the BMBF (FSP 301 FLASH).