Knowledge Bank

A formulation of relativistic multichannel quantum defect theory is presented. The relativistic random phase $approximation1$ is used to determine ab initio values of the eigenchannel parameters for isolated closed shell atoms. As an application of these relativistic techniques we analyze the line-profiles, angular distributions and spin-polarization of photoelectrons within the Beutler-Fano $resonances2-4$ for neon, argon, krypton, and xenon.