Analyzing atomic oxygen product evolution in Micro Cavity Plasma Arrays by a combination of a Multi-PMT OES Setup and a 0-D Chemical Model

Le résumé fourni par la source

Dielectric barrier discharges (DBDs) are widely used in applications such as ozone generation and volatile organic compound treatment, where performance can be enhanced through catalyst integration. A fundamental understanding of reactive species generation is essential for advancing these technologies. However, temporally resolving reactive species production, especially during the initial discharges, remains a challenge, despite its importance for controlling production rates and energy efficiency. This study examines atomic oxygen production as a model system for reactive species production in a micro-cavity plasma array, a custom surface DBD confined to micrometer-sized cavities. Optical emission spectroscopy was employed to investigate plasma-chemical processes in helium with 0.1-0.25$\%$ molecular oxygen admixture at atmospheric pressure. The discharge, powered by a 15$\,$kHz, 600$\,$V amplitude triangular voltage, achieved near-complete oxygen dissociation (up to 100$\%$), as determined via helium state-enhanced actinometry (SEA). A novel multi-photomultiplier system enabled precise temporal tracking of atomic oxygen density and dissociation dynamics. To ensure measurement accuracy, a basic 0D chemical model was developed, reinforcing the reliability of the experimental results.

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