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P: Fachverband Plasmaphysik

P 6: Atmospheric Plasmas and their Applications II

P 6.3: Vortrag

Dienstag, 1. April 2025, 11:45–12:00, ZHG006

The role of metastable atoms on the dissociation of CO₂ in the COST Reference Microplasma Jet — •Alexander Schicke, Amira Nouira, Sebastian Burhenn, Marc Böke, and Judith Golda — Plasma Interface Physics, Ruhr-Universität Bochum, 44801 Bochum, Germany

The dissociation of CO₂ has become a growing topic in recent years. There are many applications, including decarbonising the atmosphere and producing carbon for chemicals and fuels. When adding CO₂ to an rf plasma, the dissociation can nearly double using argon instead of helium as a feed gas, because of the lower excitation and ionisation energies. Consequently, the assumption was made that the dissociation of CO₂ is dominated by electron impact dissociation and dissociation via Penning collisions with metastable atoms.
Therefore, to quantify which part the metastable atoms play in the COST Reference Microplasma Jet, the respective densities of helium and argon metastable atoms were measured while changing the ratio of He/Ar in the feed gas. The metastable atom densities were measured via tunable diode laser absorption spectroscopy (TDLAS), which allows the simultaneous measurement of both densities with high spatial resolution. With this 2D maps of the discharge channel can be created, which gives us in-depth information on the dissociation of CO₂.
This work is funded by the projects A3 and B2 of the CRC 1316.

Keywords: atmospheric pressure; rf plasma; TDLAS; plasma jets; co2 conversion