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P: Fachverband Plasmaphysik

P 7: Atmospheric Pressure Plasmas and their Applications III

P 7.5: Vortrag

Dienstag, 21. März 2023, 18:00–18:15, CHE/0089

Impact of feed gas humidity on the discharge dynamics in an Ar-operating atmospheric pressure plasma jet — •Sarah-Johanna Klose, Robert Bansemer, Ronny Brandenburg, and Jean-Pierre H. van Helden — Leibniz-Institut für Plasmaforschung und Technologie e.V. (INP), Greifswald, Deutschland

Cold atmospheric pressure plasma jets are often employed for biomedical purposes as they provide a large variety of reactive species remaining around room temperature, such as atomic and molecular radicals, and key species, such as H₂O₂. In particular, hydrogen, oxygen and nitrogen containing species have been proven beneficial for wound healing and cancer treatment. The formation of these species starts in general with the dissociation of molecular gases in the plasma zone of the plasma jet. It has been shown previously that by the addition of water to the feed gas, the composition of reactive species could be changed drastically. In this presentation, we will demonstrate the impact of feed gas humidity on the discharge dynamics of the kINPen-sci plasmajet, a cold atmospheric pressure plasma jet that is operating with Ar. By means of time-resolved laser atomic absorption spectroscopy (LAAS), absolute densities of Ar(³P₂) species have been determined as a function of the feed gas humidity and of the distance to the nozzle of the plasmajet. By analysing the quenching, conclusions on the dissociation of water have been drawn, which will also be presented.