Abstract
The threshold for displacement of the sulfur atom from a lattice point in CdS has been measured to be 8.7 ev. This is accomplished with 115-kev electrons. This is also the threshold for the production of green edge emission centers and of centers for a red fluorescence band with a maximum intensity at about 7200 A. In crystals which show edge emission before bombardment, the edge emission is removed by electron bombardment in the energy range 2.5 to 200 kev. The red luminescence is not removed by electron bombardment but increases in intensity with bombardment above the threshold. The radiation ``annealing'' of the edge emission is accomplished even in crystals which do not thermally anneal. A model is proposed with the sulfur interstitial atom the center for edge emission, and the sulfur vacancy the center for the red emission band.
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