Abstract
Interactions between adsorbed species cause variations of their effective binding energies with the surface. These changes are usually roughly one order of magnitude smaller than the adsorption energies and control the equilibrium arrangements of the adsorbed particles as well as other thermodynamic properties like the adsorption isotherms. Kinetic phenomena like displacement reactions or the poisoning of adsorption sites are not well understood but may be of vital importance for the mechanism of catalytic reactions. The most striking effects occur for the transition states of chemical reactions: the interactions may become very strong, and thus lead to a dramatic lowering of the activation barrier. These different aspects are illustrated with a series of experimental results.
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