Electron Microscope Images of Dislocations

Abstract

Hirsch et al. 1 and Bollmann2 observed dark and white spots in the electron microscopic image of thin metallic film, and suggested that the contrast is caused by the Bragg reflexion due to the distorted lattice around a dislocation. We call this, for convenience, H.-B. dislocation contrast. Menter3 first observed an extra terminating half-line in the electron microscope image of platinum phthalocyanine, and suggested that the extra line is the image of the extra terminating half-plane associated with an edge dislocation in the crystal. We call this Menter's dislocation contrast. In Menter's dislocation, no contrast such as H.-B. dislocation can be observed.