MOLECULAR-INTERACTIONS AND COOPERATIVITY IN COADSORPTION - CO+NO PT(111)/

The coadsorption of different molecules on simple surfaces provides th e opportunity to examine problems that do not occur in single componen t adsorption systems. To understand cooperative adsorption phenomena a t a fundamental level, we have measured the low-coverage desorption of NO from a Pt(11) surface precovered with up to 10% of a monolayer (ML ) of CO. The data exhibit a pronounced kinetic compensation, character ized by a compensation temperature of similar to 335 K. We apply a tra nsfer matrix analysis that extracts meaningful information about surfa ce-mediated GO-NO interactions. The analysis illuminates a direct conn ection between lateral interaction energies, kinetic compensation, and enhanced versus competitive adsorption.