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) = (\frac{1}{V}) \sum_{h = − \infty}^{+ \infty}

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Preamble to the determination of phases

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Isomorphic series method

Bibliography

(1) - GRIMES (J.M.), HALL (D.R.), ASHTON (A.W.), EVANS (G.), OWEN (R.L.), WAGNER (A.), McAULEY (K.E.), VON DELFT (F.), ORVILLE (A.M.), SORENSEN (T.) et al - Where is crystallography going? - Acta Crystallogr D. Struct. Biol., 74, p. 152-166 (2018).
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