Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 19: Cluster I (joint session A/MO)
A 19.6: Vortrag
Mittwoch, 13. März 2019, 15:45–16:00, S HS 3 Physik
Investigation of polyanionic metal clusters by photoelectron spectroscopy — •Madlen Müller1, Franklin Martinez2, Norman Iwe2, Klara Raspe2, Steffi Bandelow1, Josef Tiggesbäumker2, Lutz Schweikhard1, and Karl-Heinz Meiwes-Broer2 — 1Institute of Physics, University of Greifswald, Germany — 2Institute of Physics, University of Rostock, Germany
One of the most prominent features of polyanionic systems is the Coulomb barrier (CB), already confirmed by photoelectron spectroscopy (PES) on molecules and fullerenes. Recently such studies have been extended to the field of polyanionic metal clusters. While offering a variety of sizes and charge states to analyze, metal clusters also serve as model systems with a simplified access e.g. by the liquid drop model (LDM).
The contribution presents an overview of our measurements on polyanionic metal clusters. The study includes the determination of threshold binding energies, that support the LDM along a wide range of cluster sizes and extending to negative binding energies. Furthermore, multiphoton processes and the Coulomb cut-off dominate the structure of the PE spectra. In particular, the evolution of the Coulomb cut-off with charge state and cluster size leads to further insights into the nature of the Coulomb barrier. The project has been funded by the collaborative research center SFB 652 of DFG.