Previous experiments in this laboratory, using transient techniques, have shown that a space-charge layer forms adjacent to the cathode of a colored KBr crystal when it is illuminated and subjected to a d-c field. It was further demonstrated that even at moderate voltages the space-charge field was sufficient to induce field emission from the cathode.nThe work reported here applies the space-charge theory of von Hippel et al. to determine the steady-state response to an a-c voltage and to d. c. with superposed a.c. and uses the macroscopic implications as a basis for experiments.
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