Abstract
When diffuse X-ray caused by scattering in a thermally vibrating crystal are scattered again in the same crystal, a new diffraction pattern similar to Kossel-pattern is produced. The properties of the new pattern is discussed by the use of the perturbation theory of X-ray scattering in a crystal. This discussion is similar to that given in the author's theory of Kikuchi-pattern (Acta Cryst. 8 (1955) 247). According to the present theory, the signs of crystal structure factor can be determined by examining the new pattern produced at an appro-priate crystal orientation, provided relative values of elastic constants are available.
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