SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 83: Focus Session: Ultrafast Dynamics in Nanostructures II
O 83.2: Vortrag
Donnerstag, 30. März 2023, 15:30–15:45, GER 38
Sub-picosend Elastic Response of a supported Pd Nanoparticle Ensemble studied by Time-resolved X-ray Diffraction — Simon Chung1, Thorben Eggert2, •Vedran Vonk1, Nastasia Mukharamova1, Sebastian Matera2, Roman Shayduk3, Johannes Moeller3, Nils Schewe4, Eric Sauter4, Christoph Schreuer2, Anders Madsen3, Karsten Reuter2, and Andreas Stierle1 — 1CXNS - Centre for X-ray and Nanoscience, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2Theory Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6t, Berlin, 10587, Germany. — 3European X-Ray Free-Electron Laser Facility GmbH, Holzkoppel 4, Schenefeld, 22869, Germany. — 4Institute of Functional Interfaces (IFG), Karlsruher Institut fur Technologie (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany.
We report on the results of a combined experimental and theoretical study of the structural response of a Pd nanoparticle ensemble upon fs-laser excitation. Time-resolved X-ray diffraction experiments, having a time resolution of approx. 100 fs, were performed at end-station MID of the European X-ray Free Electron Laser (XFEL). Molecular dynamics simulations were done taking explicitly into account the particle size distribution, as determined from SEM. The results are interepreted in terms of the dephasing of size-dependent elastic modes and picosecond energy dissipation of the nanoparticle ensemble towards the MgO single crystal support. An overview will be given about the experimental details, data analysis and molecular dynamics simulations.