The relativistic 5f electronic structure of delocalized $α$-U and localized $δ$-Pu from the self consistent vertex corrected GW approach and X-ray Emission Spectroscopy

The recently developed self-consistent vertex corrected GW method is used to calculate the 5f electronic structure in delocalized $α$-U and localized $δ$-Pu, each of which is confirmed by the historical experimental approaches of direct and inverse photoemission. Tender X-Ray Emission Spectroscopy (XES), in a novel application to 5f electronic structure, is used to experimentally prove the existence of 5f delocalization in $α$-U.