Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 70: Structural Dynamics in Nanoscale Materials Probed by Ultrashort Electron Pulses
O 70.9: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
Imaging, diffraction, and interferometry with ultrabright electron pulses — •Robert Bücker1, Albert Casandruc1, Chiwon Lee1, Philipp Pelz1, Haider Zia1, Günther Kassier1, and R. J. Dwayne Miller1,2 — 1Max Planck Institute for the Structure and Dynamics of Matter, CFEL, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Departments of Chemistry and Physics, University of Toronto, Toronto Ontario, M5S 3H6, Canada
High-brightness electron pulses in the ns to µs regime promise to be the optimal probe for determination of structure and irreversible dynamics in biological systems. Combined with the favorable elastic-to-inelastic ratio of electron scattering, the large transverse coherence length achievable with nanometric emitters allows maximizing the information content per scattering event, hence keeping radiation damage at a minimum and allowing to extract sufficient structural information even from small samples, such as nanocrystals. In this contribution, we present the concept, implementation, and first results of experiments tailored to these goals. This comprises both field emission-based electron diffraction beam lines in the range from few to hundreds of kilovolts, as well as transmission electron microscopes enhanced with pulsed sources and high-speed imaging detectors.
Particular attention will be paid to a compact 12 kV apparatus, designed for interferometric characterization of various kinds of pulsed electron sources, as well as proof-of-principle demonstrations of coherent diffractive schemes with bright many-electron pulses.