Abstract
Abstract The structure of cadmium iodide films evaporated onto amorphous carbon substrates has been studied by electron microscopy and diffraction. Films with average think nesses less than about 200 A are found to give random electron diffraction patterns. Thicker films consist of continuous deposits which give electron diffraction patterns similar to a single crystal oriented with its basal plane parallel to the substrate. The formation of a continuous single crystal film on an amorphous substrate indicates that cadmium iodide crystallites which condense on the substrate in the early stages of deposition undergo considerable coalescence and re-orientation as the deposition proceeds. The final orientation of the deposit is consequently independent of the orientations of the initial nuclei.
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