Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 14: Atmospheric Plasmas and their Applications IV

P 14.2: Vortrag

Mittwoch, 2. April 2025, 14:15–14:30, ZHG006

Multi-PMT System and 0-D Chemical Modeling for Analyzing Atomic Oxygen Production in Micro Cavity Plasma Arrays — •Henrik van Impel, David Steuer, Volker Schulz-von der Gathen, Marc Böke, and Judith Golda — PIP & EP2, Ruhr-University Bochum, D-44801 Bochum

Dielectric barrier discharges (DBDs) have numerous applications, including ozone generation and the treatment of volatile organic compounds, which can be further enhanced by integrating catalysts. Understanding the underlying processes requires fundamental knowledge about the generation of reactive species. In this study, we investigated atomic oxygen production within a micro cavity plasma array, a customized surface DBD confined to micrometer-sized cavities. Using optical emission spectroscopy, we analyzed the plasma chemical processes. The discharge was operated in helium with a 0.25% molecular oxygen admixture at atmospheric pressure, using a 15kHz 600V triangular excitation voltage. High dissociation degrees were observed with helium state enhanced actinometry (SEA). Utilizing a multi-photomultiplier system proved effective for monitoring the discharge, especially following the temporal evolution of the atomic oxygen density or dissociation degree, making it highly suitable for industrial applications. To further confirm the consistency of the measurements, we developed a simple 0-dimensional chemical model.

The project is funded within project A6 of the SFB 1316.

Keywords: DBD; Atmospheric pressure; Optical Emission Spectroscopy; Atomic oxygen