Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 21: Cluster II (joint session A/MO)

A 21.3: Poster

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

Time-resolved imaging of the dynamics of free metal clusters and nanocrystals — I. Barke³, N. Bernhardt², P. Behrens², •S. Dold¹, S. Düsterer⁴, B. Erk⁴, T. Fennel^3,5, 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. Rupp^2,5, F. Seel^2,5, R. Tanyag⁵, R. Treusch⁴, A. Ulmer², and S. Walz² — ¹Univ. 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.