This is an archive copy of the IUCr web site dating from 2008. For current content please visit https://www.iucr.org.

Next: Strong and Weak Structure Factor Magnitudes F_H Up: An Introduction to Direct Methods. The Previous: Introduction

Notation

H = Laue indices h k l of a reflection

K = Laue indices h₁ k₁ l₁ of another reflection

$\theta_H$ = Bragg angle of a reflection H

I_H = intensity of a reflection H ( $I_H\propto\vert F_H\vert^2$ )

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

$\phi_H$ = 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

E₃ = N^-1/2|E_HE_KE_-H-K|

E₄ = N^-1|E_HE_KE_LE_-H-K-L|