Schematic diagram of the experimental setup.
The I-V curve of negative corona discharge.
Typical current and voltage waveforms of Trichel pulse at averaged current of 25 μA for pressure of 2 Torr.
Characteristic points on a typical Trichel pulse. A—t = 216 μs, B—t = 222 μs, C—t = 228 μs, D—t = 232 μs, E—t = 233 μs, F—t = 235 μs, G—t = 237 μs, H—t = 242 μs, I—t = 252 μs, J—t = 260 μs, K—t = 280 μs, L—t = 320 μs.
ICCD photographs of discharge at different times of the current pulse (each photograph is measured at the time instants shown in Fig. 4 . Left: anode electrode, Right: cathode electrode).
Optical emission spectra near the cathode in the wavelength range of (a) 320–500 nm and (b) 500–900 nm.
Optical emission spectra near the anode.
The frequency of Trichel pulse as a function of averaged discharge current and parallel capacitances.
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