Abstract
We study the radiation field screening in MARPE and XAFS in the non-relativistic Keldysh Green's function theory. So far these terms have rarely been investigated, however they are crucial to analyse resonant effects in XPS and XAFS. In this work we demonstrate the importance of the dynamical screening to discuss these resonant effects. We find that the resonant term in XAFS is written in terms of x-ray absorption factor f(ω) and related factor f̃(ω).
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