Double-Crystal Spectrometer Attachment to the Wide-Range Goniometer of the Norelco X-Ray Diffractometer

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Abstract
The design of a double‐crystal spectrometer attachment to the Norelco wide‐range goniometer is described. The outstanding features of this design are: (1) the axes of rotation of both crystals are made parallel in the construction of the instrument; (2) one can easily align the instrument in the parallel (n, ‐n) or antiparallel (n, +n) setting in less than one hour; and (3) no modification of the Norelco equipment is needed, and good use is made of the wide‐range goniometer for setting the first crystal at the proper Bragg angle for reflection. Typical parallel position rocking curves for single‐crystal germanium and silicon are presented.