On absorption on polycrystalline substrates

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Abstract
The effect of a polycrystalline substrate on the charge of adatoms and on the work function is considered in terms of the Anderson-Newns model. Polycrystallinity is characterized by deviation δϕ i of the work function of the ith face from mean value 〈ϕ i 〉. It is found that polycrystallinity leads to an increase in the occupation numbers of adatoms as compared to absorption on a monocrystalline surface. This leads to a decrease in the value of charge in the case of electropositive adsorption and to an increase in its value in the case of electronegative adsorption. It is shown that the polycrystallinity effect must be manifested most strongly in the case of adsorption of gases at metals and semiconductors.

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