SMuK 2021 – scientific programme
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P: Fachverband Plasmaphysik
P 14: Atmospheric Pressure Plasmas and their Applications II
P 14.6: Talk
Thursday, September 2, 2021, 15:30–15:45, H5
3-dimensional density distributions of NO in the effluent of the COST-Reference-Microplasmajet — •Patrick Preissing1, Ihor Korolov2, Julian Schulze2, Volker Schulz-von der Gathen1, and Marc Böke1 — 1Ruhr-Universität Bochum, Experimentalphysik II — 2Ruhr-Universität Bochum, Angewandte Elektrotechnik und Plasmatechnik
Plasma jets are known to generate a huge number of different reactive species. In that context Nitric Oxide is one of the key players, as it triggers many biological processes. In this study absolute densities of NO are measured in the effluent of an RF-driven micro atmospheric pressure plasma jet, that is operated in a He/N2/O2 mixture, by means of Laser Induced Fluorescence, with 3-dimensional spatial resolution. The densities are measured in two distinct atmospheres. In the first one, the jet is expanding into open air, whereas in the second configuration the jet is expanding into a controlled He/air mixture. From the time resolved LIF signals the quenching coefficients for He, air, N2 and O2 are determined, as well as the intrusion of the ambient air into the He gas flow expanding from the jet. It was found that the distribution as well as the absolute densities strongly depend on the surrounding atmosphere, due to quenching and collisions. Furthermore, the NO particles are strongly coupled to the He flow of the feed gas. Parameter studies, varying different parameters such as plasma power, gas flow and gas mixture have been performed and the influence on the absolute NO densities as well as its distributions are investigated.