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O: Fachverband Oberflächenphysik

O 62: Posters: Surface Reactions and Dynamics, Nanostructures

O 62.8: Poster

Wednesday, April 2, 2014, 17:30–21:00, P1

Laser-triggered miniaturized electron gun for ultrafast low-energy electron diffraction — •Gero Storeck, Simon Schweda, Max Gulde, Sascha Schäfer, and Claus Ropers — IV. Physical Institute, University of Göttingen, 37077 Göttingen, Germany

The time-resolved analysis of structural dynamics at surfaces will yield insight into a rich class of previously inaccessible effects, which are unique to quasi-two-dimensional systems. A main experimental challenge in the realization of optical pump/ electron probe schemes is the generation of short electron pulses at low energies and their undispersed propagation to the sample. Nanometric photocathodes were recently suggested to minimize spatial and temporal broadening and have been successfully implemented in a time-resolved diffraction experiment in a transmission geometry [1].

Here, we present the development of a compact pulsed electron gun for time-resolved low-energy electron experiments in backscattering diffraction. This will provide for a novel and versatile tool in ultrafast surface science.

[1] M. Gulde et al. (submitted).