Abstract
SO-CALLED extra or forbidden rings have been observed from time to time in electron diffraction patterns, and their origin has been attributed to half-order diffractions or impurities. Cases in which more than one such ring have occurred in a single pattern have been rare. We have obtained patterns from platinum, gold, silver, cobalt, nickel, chromium, iron, tin, graphite and zinc oxide exhibiting not only up to as many as 14 ‘extra’ rings, but also remarkable circular bands with well-defined heads.
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FINCH, G., QUARRELL, A. ‘Extra’ Rings and Bands in Electron Diffraction Patterns. Nature 135, 183–184 (1935). https://doi.org/10.1038/135183b0
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DOI: https://doi.org/10.1038/135183b0
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