München 2019 – scientific programme

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P: Fachverband Plasmaphysik

P 4: Atmospheric Pressure Plasmas I

P 4.2: Talk

Monday, March 18, 2019, 14:30–14:45, HS 20

Analyzing plasma-chemical processes in RF-excited atmospheric pressure plasmas using vacuum ultra-violet and visible optical emission spectroscopy — •Judith Golda, Fenja Severing, Carmelo Setaro, and Jan Benedikt — Institute of Experimental and Applied Physics, Kiel University, Germany

Non-thermal atmospheric pressure plasma jet devices effectively generate reactive species at low gas temperature such as atomic oxygen or nitric oxide. Hence, they are commonly used for surface modification and biomedical applications. To tailor species densities, detailed knowledge and profound understanding of the plasma-chemical processes is crucial. However, due to their small dimensions, diagnostic techniques are limited.

Here, we present optical emission spectroscopy measurements of an RF-excited atmospheric pressure plasma jet operated in helium with admixtures of molecular nitrogen or oxygen. High energetic photons, such as the helium excimer continuum, are analyzed using windowless VUV spectrometry. Reaction kinetics of plasma-chemical processes and rotational temperatures will be estimated by analyzing the spatial variation of emission in the visible range of a nitrogen afterglow using a high-resolution echelle spectrometer.