SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Poster I
P 11.6: Poster
Mittwoch, 22. März 2023, 14:00–15:30, HSZ EG
Time-resolved characterization of a micro cavity plasma array using a multi-photomultiplier setup — •Henrik van Impel1, David Steuer1, Volker Schulz-von der Gathen2, Marc Böke2, and Judith Golda1 — 1Plasma Interface Physics, Ruhr-University Bochum, D-44801 Bochum, Germany — 2Physics of Reactive Plasmas, Ruhr-University Bochum, D-44801 Bochum, Germany
Dielectric barrier discharges (DBDs) have many applications, such as ozone generation or treating volatile organic compounds (VOCs). To understand the underlying processes, fundamental knowledge about the generation of reactive species is necessary. Here we investigated atomic oxygen production as a model system in a micro cavity plasma array, a customized surface DBD confined to geometrically arranged cavities of micrometer size. We studied the behavior and the plasma chemical processes using optical emission spectroscopy methods. The discharge is operated in helium with a molecular oxygen admixture of about 0.1% at atmospheric pressure using a 15 kHz and about 600V triangular excitation voltage. With helium state enhanced actinometry (SEA) [1] high atomic oxygen densities could be observed. Using a multi-photomultiplier setup with synchronous narrow bandwidth detection of characteristic transitions and SEA, we measured the temporal evolution of the atomic oxygen density and the effective mean electron energy over the first ignitions, which are affected by a memory effect due to residual charges on the dielectric surface.
The project is funded within project A6 of the SFB 1316.
[1] David Steuer et al 2022 Plasma Sources Sci. Technol. 31 10LT01