Abstract
In a demountable vacuum system a latent image is formed of a region on a metal target which has been subjected to very weak electron bombardment. This image can be made visible by electroplating the target in a copper sulphate solution. An experimental investigation of the influence of bombarding current, electron energy and target temperature is presented. The results suggest that the effect is due to the formation of a monolayer of hydrocarbon contamination, the build-up of which is catalytically accelerated by the metal target. The effect takes place even with 5 V electrons and can be used to obtain permanent visual records of slow electron beam focal spots.
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