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P: Plasmaphysik
P 22: Poster: Magnetische Fusion, Plasmadiagnostik, Dichte Plasmen
P 22.4: Poster
Dienstag, 19. März 2002, 17:40–18:40, HZO Foyer
Spatio-temporally resolved spectroscopic diagnostics of the atmospheric pressure glow discharge in nitrogen — •Ronny Brandenburg1, Kirill V. Kozlov2, Nicolas Gherardi3, Hans-Erich Wagner1, Pierre Segur4, Peter Michel1, and Francoise Massines3 — 1Institute of Physics, Ernst-Moritz-Arndt University of Greifswald, 17489 Greifswald, Domstr. 10a, Germany — 2Moscow State University, Department of Chemistry, 119899 Moscow, Russia — 3Laboratoir de Genie Electrique, Universite Paul Sabatier, 118 route de Narbonne, 31062, Toulouse Cedex, France — 4Centre de Physique des Plasmas et de leurs Applicatios, Universite Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
Dielectric barrier discharge can operate in different modes. Besides the well-known filamentary mode, a diffuse mode (often referred to as Atmospheric Pressure Glow Discharge, APGD) can be generated under special operation conditions. It is characterized by the duration in a microsecond range, while the discharge covers the entire electrode area. The development of the APGD in nitrogen (pure N2 or with admixtures of O2 of up to several hundreds ppm) is investigated by temporally and spatially resolved emission spectroscopy. Analysis of the spatio-temporal structures of the spectral bands under consideration (2nd positive system of N2, γ-system of NO and ON2-excimer radiation) has been found to provide important information concerning the mechanism of APGD. The origin of the APGD seems to be a relatively high density of metastable nitrogen molecules that act as the No-dqpre-ionizers No-dq.