1.79: Patterson methods
The family of methods employed in structure determination to derive relationships between the scattering centers in a crystal lattice when the diffraction phases are unknown. They depend upon interpretation of the Patterson function
\[P(uvw) = \dfrac{1}{V} \sum_h\sum_k\sum_l { | F(hkl) | ^2\cos[2\pi(hu + kv + lw)]} \nonumber \]
to reveal interatomic vectors within the unit cell.