Hannover 2020 – scientific programme

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P: Fachverband Plasmaphysik

P 7: Atmospheric-pressure plasma and applications 2

P 7.2: Talk

Tuesday, March 10, 2020, 11:30–11:45, b305

Vacuum ultraviolet spectroscopy of cold atmospheric pressure plasma jets — •Judith Golda¹, Beatrix Biskup², Vincent Layes², Tristan Winzer¹, and Jan Benedikt¹ — ¹Institute of Experimental and Applied Physics, Kiel University, Germany — ²Experimental Physics II, Ruhr-University Bochum, Germany

Due to elevated pressure and thus high number of three-body collisions, cold atmospheric pressure plasmas generate excimer species that can emit highly energetic photons thus transferring energy inside the discharge and to treated substrates. However, they are difficult to assess as they are absorbed by air or window material.

Here, we present a method to measure vacuum ultraviolet (VUV) photons using a monochromator with an aerodynamic window. Emission spectra of an RF-excited atmospheric plasma jet (COST-Jet) [1] were analyzed for typical gas mixtures. The data suggest that helium excimers contribute notably to the excitation of molecular and atomic species. The emission intensities do not follow the densities of ground-state species, underlining the variety of excitation channels and the change of the electron energy distribution function under changing the gas composition.

[1] J. Golda et al., J. Phys. D: Appl. Phys. 49 084003, 2016.