Abstract
SEVERAL experimenters have obtained results which they interpret as showing that electrons can be selectively reflected by crystal planes which would not give a corresponding Bragg reflection with X-rays, for example (100) in the first order for a face-centred cube. In some cases even ‘half orders’ of reflection are found. Thus in a recent paper1 Rupp finds reflections from odd orders and half orders of the (100) cleavage plane of rocksalt, and similar face-centred cubic crystals. His experiments, like the others, were made with electrons of the order of 100 volts energy, detected electrically.
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References
Rupp : Annalen der Phys., vol. 4, p. 1097; 1930.
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THOMSON, G. Electron Diffraction by ‘Forbidden’ Planes. Nature 126, 55–56 (1930). https://doi.org/10.1038/126055b0
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DOI: https://doi.org/10.1038/126055b0
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