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Pair distribution function
The atomic pair distribution function (PDF) describes the density of interatomic distances in a material. Of special practical importance is the radial pair distribution function, which is independent of orientation. It is a major descriptor for the atomic structure of amorphic materials (glasses, polymers) and liquids. The radial PDF can be calculated directly from physical measurements like light scattering or x-ray powder diffraction.
Additional recommended knowledge
In Statistical Mechanics the PDF is given by the expression:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Pair_distribution_function". A list of authors is available in Wikipedia.|