Versatile double-crystal topography camera

Abstract
A versatile double-crystal topography camera is described which has provisions for both image detection and precision rocking curve analysis for a wide variety of single-crystal samples. The camera has a variable base separating the two crystals and this base is rotatable for working with a range of diffraction vectors. The accuracy of the second crystal goniometer stage is of the order of 0.2 arc s. An example of typical data taken with this camera is displayed.

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