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Keywords:

  • pair distribution function analysis;
  • X-ray diffraction;
  • amorphous spheres;
  • asymmetric transmission geometry

A method for the calculation of the pair distribution and structure functions from X-ray intensity data obtained with an area detector for an off-center incident X-ray beam on an amorphous sphere is presented. Error propagation for converting from the structure function to the pair distribution function is also described, including a summation series approach to treat the error from a high-q truncation. A Zr58.5Cu15.6Ni12.8Al10.3Nb2.8 glass (Vitreloy 106a) is used to demonstrate the techniques. In particular, the semi-analytical corrections presented to calculate the effects of secondary scatter within and asymmetric transmission through a spherical sample are verified.