Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Novelties in Molecular Physics

MO 5.20: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Temporal characterization studies of an ultrafast electron diffractometer — •Xaver Holzapfel, Christian Gerbig, Silvio Morgenstern, Marlene Adrian, Arne Senftleben, and Thomas Baumert — University of Kassel, Institute of Physics and Center of Interdiscliplinary Nanostructure Science and Technology (CINSaT), D-34132 Kassel, Germany

Time-resolved diffraction, using x-ray or electron probes, has become a promising technique to directly provide insights into dynamics at the molecular level with ultrafast precision. We study the dynamical processes in single crystalline graphite by means of ultrafast electron diffraction in order to expand the understanding of phonon generation and decay mechanisms being essential for future carbon based electronic devices. Our highly compact DC electron diffractometer is fully characterized by experiments and N-body simulations. At balanced conditions a temporal resolution of 200 fs along with high-definition diffraction is achieved for dynamical studies.

In this contribution the temporal characterization of electron pulses is discussed in dependency of different characterization methods. We use grating enhanced ponderomotive scattering and also electron pulse autocorrelation to characterize electron pulses in situ.