Abstract
IN a letter under this title, Messrs. H. Lipson and D. P. Riley1 have made some suggestions regarding the values of the X-ray wave-lengths to be used in diffraction measurements. All wave-lengths in the X-ray spectra determined by crystal measurements are based on the value d1 = 3029.04 X.U. for the lattice constant of calcite at 18° and the corresponding values of d2, d3 for the higher orders2. As secondary standards for the longer wave-lengths, quartz d1 = 4244.92, gypsum d1 = 7579.07 and mica d1 = 9927.58 X.U. have been used. Rock salt, which was used in the very first days of X-ray spectroscopy, was abandoned because the spectral lines obtained with this crystal did not have sufficiently good definition to allow the desired precision in the measurements.
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References
Lipson, H., and Riley, D. P., NATURE, 151, 250 (1943).
Siegbahn, Manne, "Spektroskopie der Rontgenstrahlen" (2nd Edit., Berlin, 1931).
Bäcklin, E., Dr. Diss, Upsala Universitets arsskrift, 1928; Z. Phys., 93, 450 (1935).
Thyren, F., Dr. Diss, Nova Acta Regia Soc. Sci. Upsaliensis, iv, 1 (1940).
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SIEGBAHN, M. Absolute X-ray Wave-lengths. Nature 151, 502 (1943). https://doi.org/10.1038/151502a0
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DOI: https://doi.org/10.1038/151502a0
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