Abstract
Recent advances in electron microscopy have opened up exciting new possibilities for examination of the fine structure of matter. Whereas X-ray or neutron-based methods give structures averaged out over about 10 18 unit cells, high resolution electron microscopy can reduce this to some 10 4 unit cells. It is, as it were, now possible to study local variations in the terrain instead of the landscape as a whole. These local variations may represent regions of chemical constitution and activity different from those of the main structure.
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