SMuK 2023 – scientific programme
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P: Fachverband Plasmaphysik
P 7: Atmospheric Pressure Plasmas and their Applications III
P 7.6: Talk
Tuesday, March 21, 2023, 18:15–18:30, CHE/0089
Impact of humidity on the OH distribution in the effluent of an atmospheric pressure plasma jet measured by laser induced fluorescence — •Judith Golda1, Sebastian Burhenn1, Maike Kai1, Pia-Victoria Pottkämper1, Volker Schulz-von der Gathen2, and Marc Böke2 — 1Plasma Interface Physics, 44801 Bochum, Germany — 2Experimental Physics II, Ruhr University Bochum, 44801 Bochum, Germany
For plasma sources operating in ambient atmosphere, such as the COST-Jet, the environmental conditions have a sensitive impact on the reactive species leaving the discharge zone. One important parameter is humidity: Water impurities in the feed gas or diffusion of moisture from the ambient atmosphere in the gas stream can contribute to an increase of humidity in the effluent. To study these effects, OH as a side-product from the dissociation of water by the plasma can be used as a tracer molecule. Therefore, we measured the 2D-distribution of OH produced in the COST-Jet by laser induced fluorescence. To control the influence of gas composition and humidity of the ambient atmosphere, the experiments were performed inside a closed vessel. By systematically varying the water content of the gas inside the vessel by a bubbler system, the influence of humidity on the OH density profile was studied. These results were then compared to profiles, which were obtained from the variation of humidity in the feed gas providing valuable information about the production channels of OH.
Funded by the DFG in the PlasNOW project 430219886.