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A threshold for the production of two fluorescence bands in CdS under electron bombardment at - 196^∘{}C has been observed at 290 kev. This corresponds to a maximum energy transfer of 7.3 ev to the cadmium atom. The fluorescence bands produced are at about 6050 A and 1.03 {μ}. An overlay experiment in which cadmium atoms diffused into the CdS lattice in interstitial positions produced the 6050 A band which is therefore believed to be a result of cadmium interstitial atoms. The 1.03 {μ} band is believed to be a result of cadmium vacancies. This latter band can also be produced by heating undoped CdS crystals to 200^∘{}C in air, argon or vacuum.
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B. A. Kulp (1962) studied this question.
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