Berlin 2014 – scientific programme
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P: Fachverband Plasmaphysik
P 17: Poster Session - Helmholtz Graduate School for Plasma Physics
P 17.21: Poster
Wednesday, March 19, 2014, 16:30–18:30, SPA Foyer
Investigation of mass selected poly-anionic clusters by laser excitation and photoelectron spectroscopy — •Madlen Müller1, Gerrit Marx1, Patrice Oelssner2, Josef Tiggesbäumker2, Robert Wolf3, Karl-Heinz Meiwes-Broer2, and Lutz Schweikhard1 — 1Ernst-Moritz-Arndt-Universität, Greifswald, Germany — 2Universität Rostock, Germany — 3Max-Planck-Institut für Kernphysik, Heidelberg, Germany
The physics of atomic clusters is an important field of research because it bridges the domains of atomic and solid state physics. Photo-interaction experiments provide insights into the electronic structure of atomic clusters. We plan to perform photoelectron-spectroscopy experiments on poly-anionic metal clusters as model systems for electron-correlation phenomena. A magnetic-bottle time-of-flight electron spectrometer will be used to determine their electron affinity and electronic structure. In addition, the Coulomb barriers of these multiply charged cluster anions will be probed by varying the wavelength of the photo-detachment laser. The selection of the clusters of interest (with respect to element, size and charge state) will be realized by the use of a Paul trap. Moreover, higher charge-state clusters will be realized by sequential electron attachment in the trap. We present test measurements on fullerene mono- and di-anions with ultraviolet nanosecond laser pulses. In the future, measurements will be extended to poly-anionic metal clusters. The project is part of the Collaborative Research Center (SFB) 652.