An improved α₂ elimination

It is shown that it is necessary to use an angle-dependent doublet separation within a given profile when performing an α₂ elimination in X-ray diffraction line profiles. Two formulations for the doublet separation are suggested, which give better results than the doublet separation as obtained from a differentiation of Bragg's law. One formulation has the important advantage of being a constant on a sin θ scale; the other formulation may serve as the basis for a computerized monochromator.