Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 6: Atomic clusters (joint session A/MO)
A 6.6: Vortrag
Montag, 9. März 2020, 15:45–16:00, a320
Development of core-level binding energies of mass-selected lead clusters — •Klara Raspe1, Norman Iwe1, Fabian Bär2, Kariman Elshimi2, Simon Dold2, Franklin Martinez1, Steffen Palutke3, Marion Kuhlmann3, Sven Toleikis3, Josef Tiggesbäumker1, Bernd von Issendorff2, and Karl-Heinz Meiwes-Broer1 — 1Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23-24, 18059 Rostock, Germany — 2Fakultät für Physik, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany — 3Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
The high photon flux and the photon energies of several tens of eV as delivered by FLASH allow to conduct core-level photoemission studies on size-selected metal clusters in the gas phase. Interesting aspects are phenomena like core-hole screening and the subsequent dynamics triggered by the core electron emission. However, probing these nanometer-sized targets requires the preparation of a sufficiently high target density in the FEL interaction region. This condition is met by an experimental setup, which includes a high-current cluster source, a quadrupole mass filter and a radio-frequency ion trap. Photoelectron spectra of lead cluster anions have been recorded in the size range of N = 3 up to 50 atoms. The spectra show a size-dependent shift of the binding energies of the 5d electrons towards the bulk work function, which is compared to the metallic sphere model.