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SMuK 2021 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 5: Poster I

P 5.14: Poster

Dienstag, 31. August 2021, 14:00–16:00, P

RF-atmospheric pressure plasma jets as a source of vacuum-UV photons for photoionisation — •Natascha Blosczyk1, Tristan Winzer1, Judith Golda1,2, and Jan Benedikt11Institute for Experimental and Applied Physics, Kiel University, Kiel, Germany — 2current address: Experimental Physics, Ruhr-Universität Bochum, Bochum, Germany

Vacuum-UV(VUV) radiation has great use, not only as a means of analysing gas mixtures by their emission and absorption spectra, but also as a way to induce chemical reactions in a target gas. Therefore, the aim of this work is to study VUV-radiation of different atmospheric plasma sources and develop a way to efficiently use it for photoionisation at atmospheric pressure. The VUV-radiation of helium and helium/argon plasmas with excimer continua and line-radiation is measured by VUV-spectroscopy in the 60 to 200 nm range as function of the input power and admixture of different reactive gases.

Acetylene is used as a model precursor to investigate the use of VUV-photons for photoionisation and follow-up chemistry, where the generated primary ions and ions formed in the polymerization reactions are detected by positive ion mass spectrometry. The VUV-generation in the plasma is separated from the diluted acetylene gas via a controlled gas flow. To further study the effects of the photons on the chemistry, the FTIR-spectrometry will be used to study the properties of deposited thin films from the VUV-photon activated gas mixture.

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