Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 23: Atmospheric Plasmas and their Applications VI
P 23.4: Vortrag
Donnerstag, 3. April 2025, 17:15–17:30, ZHG006
Impact of ambient humidity on the OH distribution in the effluent of an atmospheric pressure plasma jet — •Robin Labenski1, Sebastian Burhenn1, Maike Kai1, Pia Pottkämper1, Marc Böke2, Volker Schulz-von der Gathen2, and Judith Golda1 — 1Plasma Interface Physics, Ruhr-University Bochum — 2Experimental Physics II, Ruhr-University Bochum
Atmospheric plasma jets are essential in fields like plasma medicine, as they can generate and deliver reactive oxygen and nitrogen species (RONS) to specific targets. A detailed understanding of their generation mechanisms and interactions with the ambient atmosphere is critical, particularly for hydroxyl (OH) radicals. This study examines OH dynamics in the COST microplasma jet (COST-Jet) using helium (He) as the feed gas. By employing laser-induced fluorescence (LIF) spectroscopy, absolute OH densities are mapped in three dimensions. Varying the humidity in both the feed gas and ambient air, the contributions of plasma and post-plasma processes to OH generation are analyzed. When water vapor is added to the feed gas, uniformly high OH densities ( 1*1014 cm−3) are observed near the nozzle, followed by rapid axial and radial decay. In contrast, ambient humidity alone produces one order lower OH densities, localized at the effluent-air boundary. Higher ambient humidity shifts the OH density peak closer to the nozzle as humidity infiltrates deeper into the effluent. This work is supported by project PlasNOW and in collaboration with projects B2 and B11 of SFB1316
Keywords: Laser-induced fluorescence; Hydroxyl; Plasma jet; Effluent; Atmospheric pressure