Letter | Published:

‘Extra’ Rings and Bands in Electron Diffraction Patterns

Nature volume 135, pages 183184 (02 February 1935) | Download Citation



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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  1. Department of Chemical Technology, Imperial College of Science and Technology, S.W.7.

    • G. I. FINCH
    •  & A. G. QUARRELL


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