Abstract
Secondary-ion mass spectrometry of photoconducting CdS-PbS films has revealed a change in the yield of positive secondary ions upon illumination. In the course of bombardment by positive oxygen ions, illu- mination of the samples by visible light decreases the yield of cadmium ions and increases that of lead ions. The observed phenomena suggest that the secondary-ion photoeffect takes place; these phenomena are called the normal and anomalous secondary-ion photoeffect, respectively. The phenomena observed are explained, and a preliminary quantitative description of these effects is proposed.
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