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By G. Wendin

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The 4 p core hole spectrum in Sn-Te in Fig. 26). As a result, the giant Coster-Kronig decay of a 4s hole in Sn will probably not The 4s, 4 p Core-Hole Spectrum in Xe and Surrounding Elements 47 be forbidden, which would lead to a considerably larger width than the Coster-Kronig width in Table 2. Furthermore, effects of relaxation of the 4d 2 and 4p 4d vacancies on the final state continuum f-electron have been considered. This can be formulated in terms of screening of the attractive potential felt by the f-electron due to the double vacancy (cf.

18c-f), the dressed electron and the dressed holes interact and all these effects can formally be included exactly by introducing an effective threebody interaction, as shown in Fig. 19 c. Therefore, Figs. 19b, c describes the full selfenery in the most compact manner possible. Although this may look like hiding the difficulties, it is really a way of organizing the difficulties, collecting them into physically relevant quantities. We shall now break down the renormalized self-energy diagram in Fig.

The situation is complicated by the fact that the experiment concerns 4 d-threshold photoabsorption and therefore involves the participation of a bound or very slow photoelectron which perturbs the picture of an interacting core hole. One therefore has to consider interactions between discrete nd continuous single and double excitations. Another case of level crossing involves the 5 p levels and occurs from 55Cs, 56Ba and upwards (Fig. 15). This leads to extremely complicated photoelectron 53' 60), Auger electron s3-55) and photoabsorption spectra 51's2) (for further details see Sect.

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