Abstract
IN noncentrosymmetric crystals the anomalous dispersion of X-rays leads, in general, to a breakdown of Friedel's law, that is to unequal diffracted intensities from reflexions of the form . A measure of this effect, which for atoms with high atomic number can be appreciable throughout the commonly used range of X-ray wavelengths, is the Bijvoet intensity ratio . Accurate measurements of the Bijvoet ratios are of considerable importance for the determination of phases in structure analysis1, in tests of the theoretically calculated values of the dispersion corrections to the atomic scattering factors2 and in the determination of the absolute configuration of molecules3. Recent determinations of absolute configurations have made use of the anomalous dispersion of CuKα radiation by atoms as light as oxygen4,5.
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