Influence of incident beam divergence on the intensity of diffuse streaks

Abstract

The influence of incident beam divergence on the length of the streak intercepted by the Ewald sphere is considered, as a relp HK·L of a faulted hexagonal crystal, mounted about its c-axis on the goniometer head attached to the ø-circle, is brought into diffracting condition for the bisecting setting of a 4-circle diffractometer. For the special crystal mounting correction factors required to convert the measured intensities corresponding to a fixed length of the streak are derived. A procedure for experimentally verifying the mathematical approach employed in these derivations is also presented. © 1985 Indian Academy of Sciences.