SMuK 2021 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 11: Complex Plasmas and Dusty Plasmas I

P 11.4: Vortrag

Donnerstag, 2. September 2021, 12:00–12:15, H4

High precision in-situ particle size measurement — •Sören Wohlfahrt, Niklas Kohlmann, and Dietmar Block — Institute of Experimental and Applied Physics, Kiel University, Germany

Microparticles are the essential component of a (dusty) complex plasma. The forces affect-ing these particles, as well as their accumulated charge, depend prominently on their size. In addition, the (complex) refractive index of the particles is of importance when optical tech-niques are used for particle manipulation or in-situ diagnostic purposes. Thus, a precise knowledge of these particle parameters is a key input for a quantitative description and modelling. However, in interaction with the plasma the particle properties can change. The size and refractive index of particles can be determined simultaneously with very high preci-sion by means of angle- and polarisation-resolved light scattering (APRLS), which is based on a comparison of experimental data with Lorentz-Mie theory [1]. We will present the time resolved evolution of the size and refractive index of silica (SiO2)- and melamine-formaldehyde (MF) microparticles. Especially the consistency and absolute precision of the measurements as well as the time resolved changes in the refractive index for MF-particles are discussed. [1] N. Kohlmann, F. Wieben, O. H. Asnaz, D. Block, F. Greiner, Phys. Plasmas 26, 053701 (2019)