Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Metal Substrates I
O 59.4: Vortrag
Mittwoch, 2. April 2014, 16:45–17:00, WIL A317
Three-dimensional atomic imaging by means of electron diffraction — •Tobias Lühr1, Aimo Winkelmann2, Gert Nolze3, and Carsten Westphal1 — 1TU Dortmund - Experimentelle Physik I, Otto-Hahn-Str.4, D 44221 Dortmund, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D 06120 Halle, Germany — 3Bundesanstalt für Materialforschung und -prüfung, Unter den Eichen 87, D 12205 Berlin, Germany
Diffraction patterns obtained with angle-resolved x-ray photoelectron diffraction (XPD) provide the information of the sample structure on an atomic length scale. Over the last three decades there were many attempts in order to obtain the sample structure applying a holographic reconstruction, due to common properties of XPD-patterns and holograms. However, anisotropic electron scattering, multiple scattering effects, as well as twin image formation generally prevented identifiable reconstructed images of the structure. Here, we demonstrate that all these problems can be circumvented by using electron diffraction patterns at kinetic energies of Ekin ≥ 10 keV. Without adding any structure information, the reconstruction reveals a three-dimensional image displaying up to thousands of atoms located at their correct position. Demonstrating the reconstruction scheme on a bcc-structure we are presenting results on more complex systems as graphite with different emitter types, and polyatomic crystals. In all cases studied up to now, the spatial image reflected the respective crystal structure with all atoms at their correct location.