Metal atoms represent a group of fluorescence centers which have the advantage of known structure. Due to their neutrality, they are not affected very strongly by their environment. The following methods have been developed for producing atomic silver in glasses and crystals. 1. Thermal dissociation of silver oxide. 2. Reduction of silver ions by means of hydrogen. 3. Reduction of silver ions by electron bombardment. 4. Reduction of silver ions through exposure to x‐rays. Experiments are described which deal with the formation of fluorescence centers of Ag + ions present in alkali halides and glasses. The fluorescence properties of these simple systems will be described.
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Weyl et al. (1949) studied this question.