A new approach for mapping x-ray rocking curves

Abstract

A new experimental geometry for simultaneously mapping the rocking curves of a sample over a one- or two-dimensional array of points on the sample has been developed. The 422 asymmetric diffraction of Cu Kα1 radiation with a monolithic channel-cut silicon crystal angularly collimates and spatially expands the x-ray beam. A cooled Reticon linear photodiode array with 25-μm spatial resolution was used for the one-dimensional detector. Compared with the commonly used double-crystal diffractometer method, more information can be obtained from the present method, for example, characterization of the minute local misorientation of subgrains and the precise determination of the curvature of a cryst..