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Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 22: Ultrafast Surface Dynamics

O 22.8: Talk

Tuesday, March 17, 2015, 12:30–12:45, MA 042

Development of Ultrafast Low-Energy Electron Diffraction — •Max Gulde1, Simon Schweda1, Gero Storeck1, Anastassia Rissanou2, Sebastian Schramm1, Manisankar Maiti1, Hak Ki Yu3,4, Alec Wodtke3, Vagelis Harmandaris2, Sascha Schäfer1, and Claus Ropers114th Physical Institute, University of Göttingen, Göttingen, Germany — 2Department of Applied Mathematics, University of Crete, 71409 Heraklion, Greece — 3Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany — 4Institute for Physical Chemistry, University of Göttingen, 37077 Göttingen, Germany

Ultrafast electron diffraction experiments have offered intriguing insights into atomic-scale structural dynamics in bulk media on their fundamental time scales [1]. In contrast, comparable time-resolved studies in quasi two-dimensional systems such as surfaces and interfaces remain challenging, despite recent accomplishments [2, 3]. Here, we introduce ultrafast low-energy electron diffraction (ULEED) in transmission as a powerful new tool for ultrafast surface science [4]. In particular, we present a detailed experimental and theoretical account of the relaxation of a polymer superstructure on free-standing graphene from a highly out-of-equilibrium state. Finally, first data from a ULEED experimental setup operated in back-reflection is presented.

[1] B. J. Siwick et al., Science 302, 1382-1385 (2003).

[2] S. Schäfer et al., J. Chem. Phys. 135, 214201 (2011).

[3] A. Hanisch-Blicharski et al., Ultramicroscopy 127, 2-8 (2013).

[4] M. Gulde et al., Science 345, 200 (2014).

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