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P: Fachverband Plasmaphysik

P 11: Poster I

P 11.18: Poster

Mittwoch, 22. März 2023, 14:00–15:30, HSZ EG

Dichromatic Mie scattering approach for particle size measurements — •Franziska Reiser, Sören Wohlfahrt, and Dietmar Block — Institute of Experimental and Applied Physics, Kiel University, Germany

Microparticles are an essential component in complex (dusty) plasmas. These microparticles are negatively charged in the plasma and levitate in the plasma sheath due to the sheath electric field. To understand structure as well as dynamical processes in dust clouds, a precise knowledge of the particle size is indispensable, as it determines charge as well as all forces acting on a particle. Recently, a suitable diagnostic based on Mie scattering was introduced [1]. It compares measured angular and polarization resolved intensity patterns of scattered light with predictions of Mie theory. However, Mie scattering is based on interference, the intensity patterns of particles which slightly differ in size and refractive index are selfsimilar and thus an ambiguity in the resulting particle size can occur. As this ambiguity is dependent on the wavelength it can be removed using two lasers with different wavelength. This contribution presents an enhanced setup using two lasers with different wavelength and discusses evaluation concepts.

[1] S. Wohlfahrt, D. Block, 2021 Phys. Plasmas 28