The Effect of an Activator on the Absorption Spectrum of Zinc Sulphide Powders

Abstract

The absorption of zinc sulphide powders, both pure and with various concentrations of activator, was measured in the region 3200-4800A by the diffuse reflection method. It was found that the long wave-length limit of the absorption band for a pure ZnS powder was at 3800A and that this limit moved to longer wave-lengths with increasing concentration of Ag activator. No evidence could be found of a secondary absorption peak characteristic of the activator.