Improving triplet-phase accuracy by symmetry observations in reference-beam diffraction measurements

Symmetry in reference-beam diffraction experiments leads to a fourfold measurement redundancy of any triplet-phase δ in a complete 360° rotation, with two of the four cases corresponding to measurements of the coupling Friedel's mate that may give rise to enhanced three-beam interference effects.

Anomalous difference signal in protein crystals

A scattering-angle-dependent formula has been developed and used to estimate the anomalous signals in single-wavelength anomalous diffraction (SAD) experiments.