Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Complex Plasmas and Dusty Plasmas II

P 16.1: Vortrag

Mittwoch, 2. April 2025, 16:15–16:30, ZHG006

Plasma surface interaction at objects at floating potential — •Dietmar Block and Sören Wohlfahrt — IEAP der CAU Kiel, Leibnizstr. 15, 24118 Kiel

A plasma as an ionized gas has markedly different properties than a normal gas. Especially the free electrons and ions can be used to trigger and enhance chemical reactions. Therefore, low-temperature plasmas are a working horse of material processing. From etching via deposition to catalytic reactions a huge variety of processes are subject of research or already used in applications. For most of them the plasma surface interaction is strongly influenced by the plasma sheath region, which has significantly different properties than the plasma bulk region. To study the chemical processes in such plasmas is not trivial. The standard approach uses ex-situ diagnostics, i.e. the treated surface is extracted from the plasma device and transferred to a diagnostic device. This approach has some limitations: the surface might change during this process and to resolve the chemical processes temporally is difficult. However, for spherical dust grains it is possible to realize an in-situ Mie-scattering diagnostic which is powerful enough to give detailed information on chemical reaction at the surface and surface modifications. Starting with a brief introduction of the diagnostic itself, this contribution will discuss the surface modification observed in-situ.

Keywords: Mie-scattering; surface modification; plasma surface interaction; Plasma-Oberflächen Wechselwirkung