Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets
MO 19.14: Poster
Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof
A setup for studying correlation effects in poly-anionic metal clusters by photoelectron spectroscopy — •Madlen Müller1, Franklin Martinez2, Gerrit Marx1, Patrice Oelßner2, Slawomir Skruszewicz2, Josef Tiggesbäumker2, Robert Wolf3, Karl-heinz Meiwes-Broer2, and Lutz Schweikhard1 — 1Ernst-Moritz-Arndt-Universität, Greifswald, Deutschland — 2Universität Rostock, Rostock, Deutschland — 3Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland
Photoelectron spectroscopy experiments provide insight into the electronic structure of atomic clusters. In the case of multiply negatively charged clusters, electron affinities and Coulomb barriers can be probed by varying the photon energy. In addition, poly-anionic metal clusters serve as model systems for electron-correlation phenomena. A setup is presented, which combines a radio-frequency ion trap, used for cluster-size selection, with a velocity-map imaging and a magnetic-bottle time-of-flight electron spectrometer. As a first test, measurements on mono-anionic fullerenes with respect to the first electron affinity, thermionic electron emission and the photoelectron angular distribution of the excess electron are conducted by the use of UV nanosecond pulses. The investigations will be extended to poly-anionic metal clusters, in the future. As higher charge states are only observed for larger cluster sizes, the enhanced requirements on the mass resolving power will be matched by a multi-reflection time-of-flight mass-separator. The project is funded by the Collaborative Research Center (SFB) 652.