The Extra Spots in Laue Photographs

Abstract

THE existence of diffuse spots in X-ray crystal photographs which do not belong to the Laue pattern has now been established^1,2,3,4,5. Explanations of the extra spots have been proposed by Preston¹, Zachariasen⁶, and Raman and Nath⁷. Following Preston's suggestion that the crystal is broken up into small groups of atoms by thermal agitation, Sir William Bragg⁸ has recently derived a formula for the intensity of X-rays scattered from a group of eight point atoms arranged at the corners of a cube of edge a. This formula may be written in the form where n = 2.