Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Complex Plasmas and Dusty Plasmas I
P 12.1: Hauptvortrag
Mittwoch, 2. April 2025, 11:00–11:30, ZHG006
Using dusty plasmas to measure low-electron sticking coefficients of dielectric materials — •Armin Mengel1, Isabel König1, Lorin S. Matthews2, Franz X. Bronold4, and Franko Greiner1,3 — 1Institute of Experimental and Applied Physics, Kiel University, Germany — 2Center for Astrophysics, Space Physics, and Engineering Research, Baylor University, Waco, TX, USA — 3Kiel Nano, Surface and Interface Science KiNSIS, Kiel University, Germany — 4Institut für Physik, Universität Greifswald, Greifswald, Deutschland
Low-energy electron sticking coefficients are of high technological interest, even though their measurement proves challenging using conventional means. Precision measurements using single dust particles confined in a low-pressure plasma have now been utilized to quantitatively determine the low-energy electron sticking coefficient of silica. The results show that dielectric and metallic surfaces in a plasma differ in charge substantially. To apply this promising measurement scheme to a broader range of materials, charging models for non-spherical particles are needed in place of the spherical capacitor model used for spherical particles. Measurements and simulations of sphere aggregates are compared against the smallest enclosing sphere (SES) model and the orientation averaged equivalent sphere (OAES) model, as well as the numerically calculated capacitance, allowing to extend the sticking measurements to non-spherical grains of dielectrics.
Keywords: non-spherical particles; dust charging; dusty plasma; sticking coefficient