Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.85: Poster

Thursday, March 11, 2010, 16:00–19:00, Lichthof

Direct Observation of Structural Dynamics in Graphite Using Ultrafast Electron Diffraction — •Christian Gerbig, Cristian Sarpe-Tudoran, Matthias Wollenhaupt, and Thomas Baumert — University of Kassel, Institute of Physics and Center of Interdisciplinary Nanostructure Science and Technology (CINSaT), D-34132 Kassel, Germany

In the recent past Ultrafast Electron Diffraction (UED) has become one of the most promising techniques to directly provide insights into fundamental physical and chemical dynamics at the microscopic level and on the pico- to subpicosecond timescale [1].
With its nature to form a wide range of bonding networks (sp, sp2, sp3) carbon is well-suited to investigate bond and lattice dynamics. So far time-resolved electron crystallography has been used to study structural dynamics of graphite sub-surfaces providing new insights in processes involving lattice vibrations [2] and coherent lattice motions [3]. In this contribution we present first results on the direct observation of optically induced structural dynamics in graphite bulk material using UED. In addition, we show improvements and a new approach of our setup, leading to a better spatial and temporal resolution with the prospect to directly resolve coherent shearing phonons in graphite.

[1] M. Chergui & A. H. Zewail, Chem. Phys. Chem. 10, 28 (2009)
[2] A. H. Zewail and coworkers, Phys. Rev. Lett. 100, 035501 (2008)
[3] R. K. Raman et al., Phys. Rev. Lett. 101, 077401 (2008)