We propose a simple layer model in which real atomic configurations are simulated by multi-layers with homogeneous electron density on each layer, in order to investigate work function of alkali-atom adsorbed graphite. Charge transfer from an alkali-atom layer to graphite layers is determined within the model by minimizing total energy. The calculated decrease in work function of graphite upon alkali-atom adsorption agrees satisfactorily with the experimental data.
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Natori et al. (1985) studied this question.
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