Final state effects in photoemission of the 4f levels of terbium and dysprosium

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Abstract
Many electron excitations in photoemission are observed to occur at selected photon energies leading to resonant photoemission enhancements of the 4f multiplet levels of terbium and dysprosium. The authors find that final state symmetry effects can alter the photon energy of the photoemission resonances of the 4f levels creating a slightly different photon energy dependence for the various 4f multiplets. Additional complications are observed because of unresolved multiplets resulting from inter-atomic correlation effects. It is final state 5d-4f interactions that give rise to a variety of valence band 4f multiplets not predicted by one-electron theory.
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