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An experimental technique has been developed for the absolute measurement of the density of a surface charge on a dielectric. The apparatus is described and includes provision for producing the surface charges by electron and ultra-violet irradiation, and by the contact of metal electrodes of known differences in work function. An account of the absolute calibration procedure is given. An outline of the examination of the fundamental carrier injection and transport mechanism in insulators by surface charge measurement is given.
D.K. Davies (Sat,) studied this question.