The phase shift upon reflection of a valence Bloch electron in Ag at the Ag/Cu(111) interface is determined by angle-resolved photoemission. It shows a singularity at the band edge of Cu, allowing a determination of the substrate band-edge energy. The singular behavior is shown to be a characteristic interfacial property. A simple-model calculation reproduces the main features of the data.
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Mueller et al. (1989) studied this question.
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