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The holmium 5p branching ratio is observed to change in angle-resolved photoemission as a result of changes in the photoemission geometry. The authors suggest that these changes are a result of final state interactions between the 5p hole and the valence 5d band structure rather than a consequence of the initial state band structure of the shallow 5p core levels. The 5d-5p final state interactions are postulated to be wave-vector dependent in angle-resolved photoemission.
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Dowben et al. (1992) studied this question.
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