High-resolution photoemission results on dilute noble-metal Pd and Pt alloys are presented. The impurity virtual-bound-state widths, splittings, and positions are determined. Using difference techniques we determine the impurity-induced changes in the host-metal d bands and compare these to predictions using a model Hamiltonian. We also discuss the importance of lattice relaxation and show that the neglect of this in first-principles calculations is probably the reason for poor agreement with experiment.
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Marel et al. (1985) studied this question.
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