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Alkali-metal adsorption on metal substrates leads to changes in the work function Δφ with changing adsorbate coverage θ. The function Δφ goes through a minimum at a certain coverage. It is demonstrated by an Anderson-model calculation that the experimental data for Δφ vs θ can be successfully explained if metallization is accompanied by a metal-substrate distance relaxation.
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Muscat et al. (1986) studied this question.
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