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P: Fachverband Plasmaphysik

P 6: Poster I

P 6.8: Poster

Monday, February 26, 2024, 16:30–18:30, ELP 6: Foyer

Impact of CO₂ on the metastable atom density in the COST Reference Microplasma Jet — •Alexander Schicke, Sebastian Burhenn, and Judith Golda — Plasma Interface Physics, Ruhr-Universität Bochum, 44801 Bochum, Germany

In the plasma community, the dissociation of CO₂ has become a growing topic over the last years. Many applications include decarbonising the atmosphere and producing carbon for chemicals and fuels. Typical degrees of dissociation of about 45% can be achieved by adding CO₂ to e.g. a helium rf-plasma. The degree of dissociation can be increased by adding argon to the helium discharge gas stream. In previous works, it was assumed that two of the main reaction pathways responsible for the dissociation of CO₂ are electron impact dissociation and dissociation via Penning collisions with metastable atoms.
Therefore, to quantify how big of a role the metastable atoms play in the COST Reference Microplasma Jet, we changed the He/Ar ratio in the feed gas while simultaneously measuring the Ar and He metastable atom densities via tunable diode laser absorption spectroscopy (TDLAS). Additionally, the density profiles were measured as 2D maps, which gives us information about the spatial distribution of the metastable atoms in the discharge channel.

Keywords: atmospheric pressure; rf plasma; TDLAS; COST Reference Microplasma Jet; metastable density