X rays, an introduction to the study of Röntgen rays (1914)
Kaye, G. W. C. (George William Clarkson), 1880-1941 · London : Longmans, Green · leaf 198
eryspot gives a different wave-length, since the values of h±,h2, and hs are different for the different spots. It is herethat an important distinction arises between a crystal gratingand a line-grating. In a line-grating an interference maxi-mum is always possible, no matter what the wave-length… … \ Fig. 84.—Pattern of Laue spots obtained by Friedrich and Knipping, whenX rays are diffracted by a zinc-blende crystal. The incident rays are parallelto a trigonal axis of the cubic crystal (i.e. diagonal-wise through centre of cube).
X-rays
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