Abstract
AN important discrepancy is beginning to make itself felt in X-ray diffraction measurements. At present, lattice spacings of crystals are based on the Siegbahn X-unit1, which is defined as 1/2814.00 of the 200 spacing of rocksalt ; this definition made the X-unit as near as possible to 10-3 A., in the light of the then-known value for Avogadro's number, N0. Such a standard was necessary because relative measurements of wave-lengths could be made much more accurately than absolute ones.
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References
Siegbahn, M., "The Spectroscopy of X-Rays" (London, 1925).
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Bearden, J. A., J. App. Phys., 12, 395 (1941).
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LIPSON, H., RILEY, D. Absolute X-ray Wave-lengths. Nature 151, 250–251 (1943). https://doi.org/10.1038/151250b0
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DOI: https://doi.org/10.1038/151250b0
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