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P: Plasmaphysik

P 4: Diagnostics II

P 4.5: Talk

Tuesday, April 3, 2001, 17:40–17:55, 2032

Time and space resolved diagnostics of single filaments in a Dielectric Barrier Discharge in air — •Ronny Brandenburg¹, Hans-Erich Wagner¹, Peter Michel¹, and Kirill V. Kozlov² — ¹University of Greifswald, Institute of Physics, Domstraße 10a, 17489 Greifswald, GERMANY — ²Moscow State University, Department of Chemistry, 119899 Moscow, RUSSIA

The temporal and spatial development of a single filament in a dielectric barrier discharge was investigated at atmospheric pressure. The used technique allows spectral and phase resolved measurements in the time scale 1...200 ns at a spatial resolution of 0.1 mm. The single filament was produced with a frequency of about 6 kHz. A symmetrical electrode arrangement with both electrodes covered by the dielectrics (glass, discharge gap width of 1 mm) was used. The time resolution in the sub-ns scale was realized by a correlation technique in single photon counting mode. The spectral investigations are focussed on the second positive system (λ= 337 nm) and the first negative system (λ= 391 nm) of nitrogen. The measurements allow a detailed visualization and interpretation of the streamer development. In combination with a kinetic model of the dominant excitation as well as quenching processes there is the possibility to get informations on the temporal and spatial development of the reduced field strength E/n too.