CO coverages as low as 10^-3 monolayers---which may result from background partial pressures in the low 10^-11 mbar range---are found to affect island shapes, island densities, step-edge barriers for adatoms and film roughness during homoepitaxial growth on Pt(111). The effects are traced to preferential adsorption of CO molecules on low coordinated Pt atoms.
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Kalff et al. (1998) studied this question.
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