Multiple-Scattering Theory of Magnetic EXAFS

This paper discusses various issues of the multiple-scattering theory of magnetic circular dichroism (MCD) in the x-ray range, especially at the K-edge of 3d transition metals. Using a semirelativistic expansion of the Dirac Green function, we show how MCD can be calculated and related to orbital momentum. Moreover, the rigid band model will be used to relate the high-energy behaviour of MCD to the exchange energy. Finally, we generalise our approach to the case of orbital polarisation, which was found to be relevant to MCD.