Heidelberg 2015 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Posters
MS 6.10: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
A setup for studying correlation effects in poly-anionic metal clusters by photoelectron spectroscopy — •Madlen Müller1, Franklin Martinez2, Gerrit Marx1, Patrice Oelßner2, 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 (PES) experiments open insight into the electronic structure of atomic clusters. In the case of multiply negatively charged clusters, electron affinities and Coulomb barriers of these species can be probed by varying the wavelength of the photo-detachment laser. In addition, poly-anionic metal clusters serve as model systems for electron-correlation phenomena. A setup is presented, which combines a Paul trap, used for cluster-size selection and poly-anion production by electron attachment, with a magnetic-bottle time-of-flight electron spectrometer. As a first test PES on mono-anionic fullerenes with ultraviolet nanosecond laser pulses has been performed. In the future, the measurements will be extended to poly-anionic metal clusters in order to explore their electronic properties. As the appearance size of an anionic cluster increases with higher charge state, the resulting need of an increased mass resolving power will be satisfied by the implementation of a multi-reflection time-of-flight mass-separator/spectrometer. The project is funded by the Collaborative Research Center (SFB) 652.