Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 11: Poster Session- Plasma Wall Interaction

P 11.3: Poster

Tuesday, March 1, 2016, 16:30–19:00, Empore Lichthof

Photoionization using VUV-light emission from a helium microplasma jet — •Pascal Vogel, Mohamed Mokhtar Hefny, and Jan Benedikt — Group Coupled Plasma-Solid State Systems, Faculty of Physics and Astronomy, Ruhr-Universität Bochum, Bochum, Germany

Atmospheric non-equilibrium plasmas have been demonstrated to be effective in many treatments relevant for medical applications, for example in inactivation of bacteria, fungi, or viruses or in treatment of cancer cells. One of the important issues in understanding the plasma-cell interaction is studying the effects of reactive plasma components (radicals, ions, photons) separately. In this work we want to study the isolated effect of ions like Ar+, O2+, N2+ and NO+, which are generated in photo ionization reactions, on a bacteria or cells. The helium plasma jet emits VUV-light with excimer continuum emission in the range from 60 to 100 nm. The photons propagate through helium gas to a point, where an additional helium gas cross flow with a small admixture of Ar, O2, N2 or NO will cross. By photoionization, the additional gas is ionized and by the cross flow separated from the other plasma components. To analyze our experiments, we use a windowless VUV-spectrograph to measure the emitted spectrum and a pA-meter to measure the ion flux to a substrate. The results of these measurements and how the produced ions can be applied to biological substrates will also be presented.