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Atomic data for opacity calculations. XVI. Ab initio calculations for Fe VIII and Fe VII

Experimental and theoretical data for energy levels and radiative transitions in Fe VIII and Fe VII are very scarce. The authors' study is a first attempt to present a comprehensive set of data, using an ab initio target representation. The close coupling approximation is used in LS coupling, including the first 9 and 31 terms of Fe8+ and Fe7+ respectively. This detailed and systematic approach generates a sound basis for future experimental and more accurate theoretical investigations. The results demonstrate the importance of electron correlation and core excitation effects in these ions.