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P: Plasmaphysik
P 4: Diagnostik 1; Niedertemperaturplasmen / Plasmatechnologie 2; Magnetischer Einschluß 2
P 4.24: Poster
Monday, March 27, 2006, 17:00–19:00, Flure
Reactive species in atmospheric pressure plasma beams in N2 / O2 / H2O mixtures — •D. Pasedag1, H. - E. Wagner1, R. Reimer1, T. Hoder2, R. Wiese3, K. V. Kozlov4, A. Baalmann5, G. Ellinghorst5, and U. Lommatzsch5 — 1Institute of Physics - IfP, University of Greifswald, Germany — 2Masaryk University Brno, Brno, Czech Republic — 3Institute of Low Temperature Plasma Physics - INP, Greifswald, Germany — 4Moscow State University, Department of Chemistry, Moscow, Russia — 5Fraunhofer - Institute for Manufacturing Engineering and Applied Materials Research - IFAM, Bremen, Germany
The subject of the investigations is a plasma beam in N2 / O2 / H2O mixtures, operating at atmospheric pressure and with a periodical voltage with frequencies from 13 to 16 kHz and amplitudes up to 8 kV. It consists of a hot (but non thermal) active plasma region inside a nozzle followed by a relaxing beam outside. The identification of dominating plasma chemical processes as well as the estimation of rotational respectively gas temperature and the flow velocity at the nozzle outlet were done by comparison of spatiotemporal resolved and also conventional emission spectroscopic measurements in different gases. The reactive species under consideration were O-atoms, NO-molecules and OH-radicals. On base of a kinetic model it was possible to estimate the amount of oxygen atoms in the remote plasma. By systematic admixture of water vapour OH-radicals were detected and their influence on the activation process of polymer surfaces was determined. The energetic properties of the plasma beam were proved by thermal probe - measurements.