Abstract

We briefly discuss recent progress in the theory of electron energy loss spectra (EELS) and related spectroscopies such as x‐ray absorption spectra (XAS). In particular we review how the real‐space Green/s function (RSGF) approach and its extensions described below can provide quantitative ab initio treatments of both XAS and EELS. We also discuss differences in these spectra due to relativistic effects and finite momentum transfer.

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