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 Ropers1 — 14th 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).