Comparison of Theoretical Doubly Differential Cross ...
Doubly differential cross sections (DDCS) for inelastic photon atom scattering that result in the ejection of a single electron are calculated for selected atoms at various incident photon energies using three different theories. One theory utilizes the relativistic second order S-matrix formalism, the other two are the relativistic and nonrelativistic impulse approximation (RIA and NRIA).