Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 14: Atmospheric Plasmas and their Applications IV
P 14.4: Hauptvortrag
Mittwoch, 2. April 2025, 14:45–15:15, ZHG006
Insights into Mode Transitions and Reactive Species Densities in a Micro Cavity Plasma Array — •David Steuer1, Henrik van Impel1, Volker Schulz-von der Gathen2, Marc Böke2, and Judith Golda1 — 1Plasma Interface Physics, Ruhr-University Bochum, D-44801 Bochum, Germany — 2Experimental Physics II: Physics of Reactive Plasmas, Ruhr-University Bochum, D-44801 Bochum, Germany
Micro-cavity plasma arrays are promising for plasma-catalytic research due to their ability to ignite plasma in direct contact with catalytic surfaces. A critical aspect of their application lies in the generation of reactive species within the cavities. He/O2 systems are ideal for studying these species, offering reduced complexity while oxygen plays a crucial role in oxidizing target gases or activating surfaces. Optical emission spectroscopy measures O-densities within the cavities, while laser-based methods analyze areas outside the discharge. A diffusion model connects these regions, revealing that atomic oxygen is generated exclusively inside the cavities, with dissociation degrees close to 100%. Transport out of the cavities is governed by diffusion and ozone formation. Varying oxygen admixtures reveals a shift from a homogeneous glow discharge (<1%) to a filamentary discharge at higher oxygen concentrations. This transition, evident in parameters as current, power, and electric field, significantly impacts conversion efficiency. Fine-tuning of the discharge mode provides a pathway to enhance plasma-catalytic performance. This work is supported by DFG within SFB1316 (A6).
Keywords: atmospheric pressure plasma; dielectric barrier discharge