The electron microscope image contrast near dislocation nodes

Abstract
The elastic displacements due to a screw dislocation node are used to compute the expected electron microscope images of a node when many reflections are operating. It is shown that unextended nodes may appear to be extended, and that adjacent nodes in a network may appear to have different sizes. It is not possible to distinguish an extended from an unextended node unless the extension of the node is greater than an appreciable fraction of an extinction distance.

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