Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 23: Complex Plasmas and Dusty Plasmas II

P 23.5: Talk

Thursday, February 29, 2024, 17:45–18:00, ELP 6: HS 3

The low-energy electron sticking coefficient of dielectric materials — •Armin Mengel and Franko Greiner — Institute of Experimental and Applied Physics, Kiel University

An important property of surfaces is their interaction with electrons, which often depends on the electron energy. In particular, the electron sticking coefficient affects the plasma-surface interaction, amongst others, and has an impact on dust charging in a plasma. While it can be measured well using electron beams for conducting surfaces or at high energies, this conventional approach fails for dielectric materials at low energies (<10 eV). By introducing a micrometer-sized grain of dielectric material into a low-pressure discharge, we can investigate the interaction of the dielectric surface with the ambient electrons of the plasma (T_e≈ 2...5 eV). Using a relative measurement scheme employing electric particle excitation methods like PRRM or PEOM as well as long-distance microscopy, the sticking coefficient of the dielectric material can then be determined in relation to particles with a conducting surface.

Keywords: Microparticles; Electron Sticking; Plasma-Surface Interaction; Dusty Plasma