A reflecting variable bent crystal spectrometer is described which in some forms varies between Johann and Johansson arrangements. The variable bent crystal and its spectrometer arrangement differ from the Harker concept. The variable control features of this spectrometer permit compensation for tolerances, application, and aging. As a result this combination of events has already resulted in achieving experimental signal-to-noise ratios as high as 3100 to 1 using a mica crystal on pure silicon. Other features permit direct comparison of relative x-ray intensities without diffraction volume correction.
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