Sayre equation

The Sayre equation is a mathematical relation used in the context of X-ray crystallography, particularly in the study of macromolecular structures. It is named after the scientist who contributed to its formulation, Donald Sayre. The equation establishes a relationship between the structure factors of a crystal and the electron density within the crystal. Specifically, it relates the intensity of the diffracted X-rays to the electron density of the crystal lattice.