Abstract
IT has been predicted recently1 that the anomalous scattering of X-rays found close to an absorption edge would make direct Fourier synthesis methods applicable to non-centrosymmetrical crystals. In this procedure isomorphous substitution would be utilized for the determination of the absolute values of the phase angles of the scattered radiation; the phase angles are simply calculated from the structure factor triangle with sides F 1, F 2 and F 1 – F 2, where F 1 and F 2 denote the structure factors of the two isomorphous compounds while F 1 – F 2 is the difference in contribution of the heavy and light atom. The signs of the phase angles should then in principle be determinable from the effect of anomalous scattering on the intensities.
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References
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PETERSON, S. Anomalous X-Ray Scattering at Wave-lengths far from an Absorption Edge. Nature 176, 395 (1955). https://doi.org/10.1038/176395a0
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DOI: https://doi.org/10.1038/176395a0
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