Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 6: Correlation dynamics in plasmas and clusters II
A 6.2: Hauptvortrag
Montag, 12. März 2012, 14:30–15:00, V57.01
Short-Time Dynamics of Dust Clusters in Plasmas — •Andre Melzer1, Tobias Miksch1, Andre Schella1, Jan Schablinski2, Dietmar Block2, and Alexander Piel2 — 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald — 2IEAP, Christian-Albrechts-Universität Kiel
Dust clusters show a wide variety of fascinating dynamic properties which strongly depend on the exact particle number. For example, they can be heated from an ordered, solid state to a fluid state or perform normal mode oscillations. Moreover, magic number configurations show high structural and dynamical stability.
Dust clusters consist of a small number of microspheres (dust) trapped in a gaseous discharge plasma. There, the particles attain high negative charges due to the inflow of plasma electrons and ions.These dust clusters can be confined in 2D or 3D arrangements depending on the plasma conditions. They are ideally suited to measure the dynamical properties on the kinetic level of individual particles by (stereoscopic) video microscopy.
Here, we like to address the question of solid-liquid phase transitions in these finite systems in both 2D and 3D as well as their normal modes. These allow a detailed insight into the physical mechanisms of dust systems in particular and charged clusters in general.
This work is supported by DFG under SFB-TR24 and DLR under 50WM1138.