Abstract
The appearance of strong-beam images of near-surface screw dislocations in stainless steel has been discussed by Howie and Whelan who showed that the contrast in strong-beam bright-field and dark-field images of such dislocations were pseudo-complementary in a manner analogous to the more familiar stacking-fault fringe contrast. This observation was explained using the concept of anomalous absorption. The screw dislocations were left behind by edge dislocations gliding in the thin foil and were assumed to prevented from slipping out of the foil by the oxide layer on the foil surface. In this paper it will be shown that strong-beam images of edge dislocations trapped near the surface of NiO foils show similar contrast. In addition a clear difference in the intensity of the corresponding weak-beam images recorded using ± g has been found. The unusally strong contrast which is possible in weak-beam images of these near-surface dislocations has also been reported by Little et al.
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