Elastic scattering and the associated anomalous dispersion in the energy range 8.63 < E < 42.75 keV from heavy atoms

Elastic scattering cross-sections for Pt, Au and Ph were measured using nearly monoenergetic unpolarized Ka x-ray photons in the energy range 8.63 less than or equal to E less than or equal to 42.75 keV at an angle of 90 degrees. The experimental results were compared with theoretical elastic scattering cross-sections calculated using relativistic form factors (RFFs), relativistic modified form factors (RMFs), a combination of RFFs, RMFs with angle-independent anomalous scattering factors (ASFs) and relativistic numerical calculations based on the multipole expansion of the second-order S-matrix approach. The experimental results were in reasonable agreement with the S-matrix values and values based on an RMF + ASF approach compared with an RFF + ASF approach.