Theoretical and experimental determination of K - And L -shell x-ray relaxation parameters in Ni

M. Guerra acknowledges the support of the FCT, under Contract No. SFRH/BPD/92455/2013. This work was supported in part by the research center Grants No. UID/FIS/04559/2013 to LIBPhys-UNL, and No. UID/MULTI/04046/2013 to BioISI, from the FCT/MCTES/PIDDAC. Laboratoire Kastler Brossel is "Unite Mixte de Recherche du CNRS, de l' ENS et de l'UPMC" No. 8552. Parts of this work have been carried out in the framework of the Project 14IND01 3DMetChemIT, funded by the EMPIR program, co-financed by the Participating States and from the European Union's Horizon 2020 research and innovation program. Fluorescence yields (FY) for the Ni K and L shells were determined by a theoretical and an experimental group within the framework of the International Initiative on X-ray Fundamental Parameters (FPs) collaboration. Coster-Kronig (CK) parameters were also measured for the L shell of Ni. Theoretical calculations of the same parameters were performed using the Dirac-Fock method, including relativistic and QED corrections. The experimental values for the FY and CK were determined at the PTB laboratory in the synchrotron radiation facility BESSY II, Berlin, Germany, and are compared to the corresponding calculated values. publishersversion published