Hannover 2020 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Atmospheric-pressure plasma and applications 3
P 12.4: Vortrag
Mittwoch, 11. März 2020, 12:00–12:15, b305
The spatial distribution of HO2 in a cold atmospheric pressure plasma jet investigated by cw cavity ring-down spectroscopy — •S.-J. Klose1, M. Gianella2, K. Manfred2, H. Norman2, G. A. D. Ritchie2, and J. H. van Helden1 — 1Leibniz Institute for Plasma Science and Technology (INP), Greifswald, D — 2Department of Chemistry (PTCL), University of Oxford, UK
In order to tailor the impact of cold atmospheric pressure plasma sources on biomedical or semiconductor targets, a profound understanding of the chemical reaction network is pivotal. One big open question in the field of plasma-liquid interaction is still, where the reactive species come from: Are they produced in the gas phase and diffuse into the liquid or are they formed via secondary reactions inside the liquid? We investigate the gas phase reactions of the cold atmospheric pressure plasma jet kINPen, already used for wound healing and in cancer research, in order to understand the reaction kinetics of H2O2, which is a key species in the plasma to cell interaction. The small diameter of these plasma jets, which is usually in the order of mm's, makes diagnostics challenging. A common approach to obtain absolute species densities are absorption spectroscopy techniques. To increase the absorption path length, cavity-enhanced spectroscopy methods can be applied. However, with these techniques often line-of-sight densities without any spatial information are obtained. Nevertheless, with cw cavity ring-down spectroscopy, we were able to determine the spatial distribution of the HO2 radical that is involved in the formation and destruction of H2O2.