Spatial and temporal distributions of ozone after a wire-to-plate streamer discharge

An ultraviolet (UV) absorption technique is used to investigate the spatial and temporal distributions of ozone after a positive streamer discharge in air at atmospheric pressure. The discharge apparatus consists of a 45-cm long wire-to-plate configuration with an electrode gap distance of 2.5 cm. Results show an average ozone density of about 5/spl times/10/sup 15/ cm/sup -3/ in an area of 2 mm/sup 2/ just below the positive electrode after application of a voltage pulse with an amplitude of 65 kV and a duration of 80 ns. Toward the cathode, the ozone density decreases rapidly. The ozone diffusion coefficient ranges from below 0.3 to about 0.6 cm/sup 2//s, indicating a spatial and temporal distribution of the gas temperature throughout the discharge gap as well.