Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 3: Ultrafast Electron and spin dynamics at interfaces I
O 3.6: Vortrag
Montag, 12. März 2018, 11:45–12:00, MA 005
Highly efficient end station for space-, time- and spin-resolved photoemission spectroscopy at free electron lasers. — •D. Kutnyakhov1, F. Pressacco2, G. Mercurio2, L. Wenthaus2, H. Meyer2, S. Gieschen2, A. Oelsner3, C. Tusche4,5, Y.J. Chen4,5, D. Vasilyev6, K. Medjanik6, G. Brenner1, S. Dziarzhytski1, H. Redlin1, H.J. Elmers6, G. Schönhense6, Y. Acremann7, and W. Wurth1,2 — 1DESY, Hamburg, Germany — 2CFEL, Univ. Hamburg, Germany — 3Surface Concept GmbH, Mainz, Germany — 4FZ Jülich GmbH, Germany — 5Univ. Duisburg-Essen, Germany — 6Univ. Mainz, Germany — 7ETH Zürich, Switzerland
High repetition rate XUV and soft X-ray free electron lasers (FELs) such as FLASH at DESY, Hamburg offer unique possibilities for time-resolved photoelectron spectroscopy (TR-PES). To fully exploit these possibilities it is necessary to use very efficient photoelectrons detection schemes. Combining a time of flight momentum microscope with the FEL as a source is ideal for time- and angle-resolved PES and TR-X-ray photoelectron diffraction to study ultrafast electron- and lattice dynamics. The momentum microscope allows simultaneous detection of the entire band structure with unprecedented efficiency in the full surface Brillouin zone with 3.4 Å−1 dia. and 4 eV binding energy range or the angular pattern of core level photoelectrons, respectively, for each time step in a pump-probe experiment. Adding the imaging spin detector extends the capability to detect the spin polarized band structure of the material. The set up was commissioned at FLASH and first results will be presented. Funding BMBF 05K16PGB.