Abstract
The theory of light scattering by crystals is developed in a form adapted to modern theories of lattice imperfections. In addition to thermal scattering, configurational scattering of two different types is considered: (1) scattering by macroscopically homogeneous distributions of point imperfections (vacancies, impurities) characterized by their concentration, polarizability, and radial distribution function, (2) scattering by bad regions in the neighborhood of dislocation lines characterized by their size, shape, and index of refraction. Interpreting recent scattering experiments in terms of this theory one estimates that single crystals of Harshaw sodium chloride have a dislocation density between 10 7 and 10 9 cm −2, an average vacancy concentration between 10 15 and 10 17 cm −3 and bad regions with an average diameter of about 1000A and an excess vacancy concentration of about 10 18 cm −3.
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