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P: Fachverband Plasmaphysik

P 3: Atmospheric Pressure Plasmas and their Applications I

P 3.6: Vortrag

Montag, 30. August 2021, 18:00–18:15, H6

Electric field strengths within a micro cavity plasma array measured by Stark shift and splitting of helium — •Sebastian Dzikowski¹, Syvain Iseni², Judith Golda³, Marc Böke¹, and Volker Schulz-von der Gathen¹ — ¹Experimentalphysik II, Ruhr-Universität Bochum — ²GREMI, Universität Orlèans — ³Plasma Interface Physics, Ruhr-Universität Bochum

Over the last years micro-structured plasma devices have received increased attention for decomposition and reformation of volatile organic compounds (VOC) [1]. Here, we present a metal-based microcavity reactor which is a demountable alternative to silicon-based devices. This layer-structured reactor consists of a nickel foil operating as an electrode and an electrically grounded magnet. Both electrodes are separated from each other by a 40 microns thick dielectric foil. The nickel foil consists of four sub-arrays where hundreds to thousands of cavities in the 100 microns range are arranged equally. To obtain more control over charged particles, the electric field is of high importance. Here, the Stark effect of the allowed 492.19 nm Helium line and its forbidden 492.06 nm counterpart is exploited. By using a combination of a plane grating spectrometer and an attached ICCD camera the typical displacement of about 0.2 nm between both transitions can be resolved. With that technique spatial integrated and phase-resolved electric field strengths with a time resolution up to one microsecond can be measured for this reactor depending on operation and geometric parameters. Depending on the polarity of the applied voltage, the electric field increases with smaller cavity diameters up to 60 kV cm-1.