research papers
The generalized density function that is the Fourier transform of X-ray diffraction as observed when anomalous scattering occurs is described. This is a complex function in contrast to the purely real electron-density function that pertains when only the 'normal' Thomson scattering component is present. The imaginary component of this general density function produces an image of the anomalous scattering centers and is more accurate than the Kraut approximation commonly used in macromolecular crystallography to produce such images.