| 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 1018 unit cells, high resolution electron microscopy can reduce this to some 104 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. |
