Göttingen 2025 – scientific programme

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P: Fachverband Plasmaphysik

P 12: Complex Plasmas and Dusty Plasmas I

P 12.2: Talk

Wednesday, April 2, 2025, 11:30–11:45, ZHG006

Measuring Diffusion in Dusty Plasma Using Differential Dynamic Microscopy — •Yang Liu and Dietmar Block — IEAP, Christian-Albrechts-Universität, D-24098 Kiel, Germany

Differential Dynamic Microscopy (DDM) is an emerging Fourier-space-based measurement technique that extracts dynamic information similarly to light scattering, combining the sensitivity of scattering with the direct visualization advantages of microscopy [1]. In this study, we propose a new method for measuring diffusion in dusty plasma using DDM. We assume that particles interact via a screened Coulomb potential and generate a series of images that allow to extract the particle motion and to quantify the accuracy and effectiveness of DDM analysis. The particle dynamics are obtained from Langevin dynamic simulation [2, 3]. The results show that, due to the micro frictional damping arising from a neutral gas background, the effects of hydrodynamic interactions (HIs) between multiple particles can be neglected. This study extends the applicability of the DDM method to Yukawa systems, thereby enabling accurate characterization of the diffusion behavior of strongly interacting particles.

References [1] R. Cerbino and V. Trappe, Phys. Rev. Lett. 100, 188102 (2008). [2] M. Gu, Y. Luo, Y. He, M. E. Helgeson, and M. T. Valentine, Phys. Rev. E 104, 034610 (2021). [3] Y. Liu and D. Block, Phys. Plasmas 31, 103701 (2024).

Keywords: Differential Dynamic Microscopy; Langevin dynamic simulation; Diffusion; Strongly coulped system; Yukawa systems