Abstract
Photo-induced non-self-sustained discharges are studied in point–plane gaps in air. Point electrodes made of different materials and with different non-metallic coatings (including TiO2 and HfO2) are tested with varying intensity of radiation and voltage. It is found that the quantum yield of photoemission (electrons per photon) changes with time and depends on the radiation intensity and applied voltage. It is assumed that the tunnelling of electrons through the barrier at the metal–dielectric interface and the finite capacitance of the electron reservoir at the dielectric–gas interface limit the current. The results of the model fit with the experimental findings.
Published Version
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