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research papers
The general equation of the conic representing the intersection of the receiving-slit plane with the diffraction cone as well as with the reflection cone of a plane crystal monochromator are given for a diffractometer in Bragg-Brentano geometry. Apart from the fact that this equation can be easily used to calculate the total instrument function as well as specific instrument functions for diffractometers in Bragg-Brentano geometry, it also provides tools for elucidating different aberrations of the diffractometer in Bragg-Brentano geometry.