Preamble to the determination of phases
BioMolecular Crystallography From phases determination to final structure
Quizzed article REF: P1111 V2
Preamble to the determination of phases
BioMolecular Crystallography From phases determination to final structure

Author : Jean CAVARELLI

Publication date: December 10, 2018, Review date: October 23, 2020 | Lire en français

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1. Preamble to the determination of phases

The elastic diffraction of X-rays by a crystal gives access to a function called electron density, which to a first approximation reflects a continuous distribution of electrons in the crystal lattice. In theory, this function is calculated for each point of relative coordinates (x, y, z) of a crystal lattice from the moduli and phases of each reflection hkl by the relation :

ρ(x,y,z)=(1V)h=+
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