Abstract
A set of general expressions for photoionization cross sections ofatoms or molecules embedded in a medium and a dielectric influencefunction are derived based on Maxwell's equations and theBeer–Lambert's law in this work. The applications are performed forthe photoionization process of solid gold both in theClausius–Mossotti (virtual cavity) model and theGlauber–Lewenstein (real cavity) model firstly. The results showthat the present theoretical expressions of photoionization crosssection can be used to describe the photoionization process ofatoms in condensed matter properly.
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