A model for the work-function change caused by adsorption on stepped surfaces is studied and discussed. The equilibrium concentration profiles of adsorbed particles at step and terrace sites at different coverage and temperature is calculated by means of a Monte Carlo simulation. The obtained profiles allow us to evaluate the work-function changes by use of the Helmholtz equation and the experimental evidence which shows that the dipole moment of the adparticles depends on the adsorption site. Our results are in agreement with available experimental data and we point out that special care must be taken in order to interpret the work-function changes measured by use of polycrystalline samples and step-``contaminated'' single crystals.
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Albano et al. (1987) studied this question.
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