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*H* = Laue indices *h k l* of a reflection

*K* = Laue indices *h _{1}*

= Bragg angle of a reflection *H*

*I*_{H} = intensity of a reflection *H* ()

*F*_{H} = the structure factor of *H*. In this work *F*_{H} will be corrected for
thermal motion and brought onto an absolute scale.

*E*_{H} = normalised structure factor of *H*

*U*_{H} = unitary structure factor of *H*

*G*_{H} = structure factor of *H* based on the squared structure

= phase of reflection *H*

*N* = number of atoms in the unit cell

*f*_{j} = scattering factor of atom *j*

*Z*_{j} = atomic number of atom *j*

*r*_{j} = position of atom *j* in vector notation

*x*_{j}, *y*_{j}, *z*_{j} = position of atom *j* in Cartesian coordinates

*E _{3}* =

*E _{4}* =

**Copyright © 1984, 1998 International Union of
Crystallography**