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Probing photo-ionization: simulations of positive streamers in varying N<sub>2</sub> : O<sub>2</sub>-mixtures
Photo-ionization is the accepted mechanism for the propagation of positive streamers in air though the parameters are not very well known; the efficiency of this mechanism largely depends on the presence of both nitrogen and oxygen. But experiments show that streamer propagation is amazingly robust against changes of the gas …