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Rostock 2019 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 17: Cluster II (joint session A/MO)

MO 17.3: Poster

Mittwoch, 13. März 2019, 16:15–18:15, S Fobau Physik

Time-resolved imaging of the dynamics of free metal clusters and nanocrystalsI. Barke3, N. Bernhardt2, P. Behrens2, •S. Dold1, S. Düsterer4, B. Erk4, T. Fennel3,5, H. Hartmann3, L. Hecht2, A. Heilrath2, R. Irsig3, B. v. Issendorff1, N. Iwe3, J. Jordan2, B. Kruse3, B. Langbehn2, B. Manschwetus4, F. Martinez3, K.-H. Meiwes-Broer3, T. Möller2, K. Oldenburg3, C. Passow4, C. Peltz3, D. Rupp2,5, F. Seel2,5, R. Tanyag5, R. Treusch4, A. Ulmer2, and S. Walz21Univ. Freiburg — 2TU Berlin — 3Univ. Rostock — 4FLASH@DESY — 5MBI Berlin

Wide angle X-Ray diffraction has been proven a viable tool to determine the 3D structure of single metal clusters in gas phase with a single X-Ray Pulse. We utilize the fs X-Ray pulses at the FLASH Free-Electron Laser in Hamburg to resolve ultrafast processes in metal clusters by reconstructing their shape in a time-dependent manner and simultaneous time-of-fight spectrometry of the ionic fragments. Exploiting the plasmon resonance of silver nanoparticles we use optical picosecond-second laser pulses to efficiently pump their electronic system. Picoseconds later we retrieve the resulting shape of the cluster. For moderate pumping energies (0.5 eV/Atom) we expect so see melting effects, whereas high energy input leads to the formation of a nanoplasma and disintegration of the cluster. To meet the demanding requirements for such experiments a carefully taylored source for clusters was developed. This source as well as a novel optical cluster detector will be presented and an overview of preliminary results from our recent experiments at FLASH will be given.

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