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Abstract
The motion of α and β dislocations in CdS under the influence of an electron beam has been studied in the transmission electron microscope. The enhanced mobility of the α dislocations with respect to the β dislocations is explained in terms of point-defect locking, and the observations give further evidence that the dislocations are of the glide set. The observed dislocation vibration is explained in terms of the interaction of charged double kinks with the dislocation line.