Theoretical and experimental investigations on the magnetic EXAFS at the K- and L2,3-edges of bcc-Fe

A fully relativistic theoretical description of magnetic EXAFS (MEXAFS) is presented that has been set up in the framework of relativistic multiple-scattering theory on the basis of the Dirac equation for spin-polarised, magnetic solids. This approach is applied to supply a detailed interpretation of new and very accurate experimental data for the K- and L2,3-edges of bcc-Fe that have been recorded for photon energies up to 600 eV above the Fermi level. In particular it is demonstrated that the MEXAFS spectra can be interpreted on the basis of the so-called sum rules.