Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 83: Poster Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses
O 83.2: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Ultrafast electron diffraction with RF-compressed electron pulses — •Marius Milnikel1, Patrick Lapsien1, Martin Otto2, Laurent P. René de Cotret2, Nico Rothenbach1, Soma Salamon1, Alexandra Terwey1, Ping Zhou1, Bradley J. Siwick2, Heiko Wende1, and Klaus Sokolowski-Tinten1 — 1University of Duisburg-Essen and Centre for Nanointegration Duisburg-Essen, Faculty of Physics, Lotharstraße 1, 47057 Duisburg, Germany — 2Department of Chemistry, McGill University, 801 Sherbrooke St., Montreal, Quebec, Canada
One of the major challenges in ultrafast electron diffraction (UED) is the electron pulse broadening induced by space-charge effects at high bunch charge. It has been demonstrated that the linear chirp introduced by this effect allows re-compression of the electron pulses to a pulse duration of about 100 fs by a time-dependent electrical field using a radio-frequency cavity at bunch charges of up to 106 electrons [1,2]. Here we report about our current efforts to set up such a RF-compressed electron source based on the concept introduced in [1], which has been recently commercialized [3]. Additionally we will present results of time-resolved diffraction experiments on metal-insulator heterostructures performed at the RF-compressed short pulse electron source at McGill University [2].
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