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High- and low-energy X-ray photoemission is discussed by using Dyson orbitals which are useful to describe the many-body effects. Up to the first-order interaction between the photoelectron and the remaining system is taken into account. Also the formal discussions are given for EXAFS, XANES and resonant photoemission. One of the first-order interaction terms is essential for the discussion of resonant photoemission, and may be important for the discussion of XANES in this theoretical framework.
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Takashi Fujikawa (1982) studied this question.
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