Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 8: Complex Plasmas and Dusty Plasmas I

P 8.4: Vortrag

Dienstag, 6. März 2018, 11:40–11:55, KI 1.174

Laser heating of finite binary mixtures in complex plasmas — •Frank Wieben, Tobias Kramprich, and Dietmar Block — Institute of Experimental and Applied Physics, Kiel University, Germany

Complex plasmas, plasmas containing microparticles, are excellent model systems to study the thermodynamic properties of Yukawa systems. In recent experiments laser heating methods proved to be perfect tools to investigate phase transitions in monodisperse 2D and 3D particle ensembles. The melting temperature of finite clusters strongly depends on the total number of particles and the exact configuration of the system. As simulations on the melting of 2D binary Coulomb clusters suggest, the melting temperature in systems containing two species of different sizes and charges also depends on the mixing- and charge-ratio. However, up until recently there has been no experimental access to 2D binary mixtures since particles of different sizes leviate in separated layers. By combining particles of different materials 2D binary mixtures can be generated [1]. In this contribution experimental and simulation results on the heating of finite binary particle systems (N ≈ 100) are presented. The melting and relaxation behavior of these two-component systems show a strong dependance on the mixing ratio. This work was supported by the Deutsche Forschungsgemeinschaft DFG in the framework of SFB TR 24 Greifswald Kiel, Project A3b and of Research Grant BL555/3-1.

[1] Wieben et al, Phys. Plasmas 24, 033707 (2017)