Stuttgart 2012 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 4: Astrophysikalische Plasmen
P 4.5: Vortrag
Montag, 12. März 2012, 15:25–15:40, V57.02
Collision frequency in nanoclusters – Molecular dynamics simulations — •Mathias Winkel1,2, Lukas Arnold1, and Paul Gibbon1 — 1Jülich Supercomputing Centre, Forschungszentrum Jülich GmbH, 52425 Jülich — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt
With the recent developments in experimental possibilities in creation and diagnostics of metallic nano clusters, the exploration of their interaction with the radiation field gained some importance during the last few years.
Since the quasi free electrons inside the cluster are confined to a very small volume, their collective properties significantly change in comparison to bulk matter. Extending earlier simulations of Raitza et al. [1], we examine optical properties of laser-excited nanoclusters. In particular, we study the dynamical collision frequency in a sodium-like material. To cover a broad range from nano- to microscale, the momentum autocorrelation function is evaluated in classical molecular dynamics simulations for systems with less than 200 up to few hundred million electrons. Therefore, we utilize our highly scalable parallel Barnes-Hut tree code pepc that has been developed at JSC [2].
First results for the collision frequency in metallic nanoclusters are shown and compared to the respective bulk properties.
- 0em [1] T. Raitza et al., Phys. Rev. E 84 (2011), 036406
- [2] M. Winkel et al., Comp. Phys. Comm. (2012), in press