Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 116: Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses III
O 116.5: Vortrag
Freitag, 16. März 2018, 11:45–12:00, HE 101
Time resolved X-Ray Photoelectron Diffraction of Quasi Freestanding Monolayer Graphene — •D Curcio1, K Volckaert1, D Kutnyakhov2, M Bianchi1, J Miwa1, C Sanders1, S Ulstrup1, F Pressacco2, G Brenner2, K Medjanik3, D Vasilyev3, S Agustsson3, Y-J Chen8, F Speck5, K Bühlmann6, R Gort6, F Diekmann7, K Rossnagel7, Y Acremann6, T Seyller5, C Tusche4, J Demsar3, H-J Elmers3, G Schönhense3, W Wurth2, and P Hofmann1 — 1Aarhus University — 2DESY Photon Science — 3Johannes Gutenberg Universitat Mainz — 4Forschungszentrum Jülich (FZJ) — 5Technische Universitat Chemnitz — 6ETH Zurich — 7Christian-Albrechts-Universitat zu Kiel — 8Universität Duisburg-Essen
We report the expansion for the first time of x-ray photoelectron diffraction (XPD) to the ultra-fast time domain by implementing it as a pump probe photoemission technique.
Conventional XPD has proven to be a powerful and efficient tool to probe structural order in matter. The expansion to the time domain allows the exploration of the structural dynamics in surfaces giving a completely new tool for the direct observation of surface structural dynamics.
The novel technique has been implemented at the FLASH free electron laser facility at DESY (Hamburg) by employing a time-of-flight momentum microscope, and it has been applied for the first time to give structural information on the dynamics of a quasi-freestanding monolayer graphene sample following excitation by a 800nm laser pulse.