A scanning microscope is described which is capable of a point resolution of 0.5 nm. We have demonstrated that it can produce the same kinds of micrographs as a conventional microscope. However, by using several detectors to produce signals corresponding to different groups of transmitted electrons we are able to produce an image contrast closely proportional to Z, the atomic number. Such a system is very promising for the study of stained molecules.
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Albert V. Crewe (1971) studied this question.