Anomalous Dispersion Phasing
Near an absorption edge a heavy atom scatters with a phase shift, breaking Friedel's law so that I(hkl) ≠ I(-h-k-l); these small differences locate the anomalous substructure and yield phases. SAD uses one wavelength at the peak and now dominates, while MAD exploits several wavelengths to separate the dispersive and anomalous contributions.
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Near an absorption edge a heavy atom scatters with a phase shift, breaking Friedel's law so that I(hkl) ≠ I(-h-k-l); these small differences locate the anomalous substructure and yield phases. SAD uses one wavelength at the peak and now dominates, while MAD exploits several wavelengths to separate the dispersive and anomalous contributions.
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