Evaporated films of arsenic trisulfide: Physical model of effects of light exposure and heat cycling

Abstract
The optical‐storage effect in evaporated films of arsenic trisulfide (As2S3) has been investigated. The physical and chemical aspects of the films were studied using a combination of etching, x‐ray diffraction, ir spectroscopy, and annealing experiments. This study of the As2S3 optical‐storage medium has culminated in the development of a physical model involving three well‐defined states for the medium.