Adsorbate-adsorbate interaction among NO and CO coadsorbed on Pd(100)

Monte Carlo simulations have been carried out for the competitive desorption from View the MathML source, in which changes in the adsorbate-metal bonds and formation of the mixed (NO + CO) islands are taken into account. It is suggested that the second-nearest neighbor interactions among NO and CO should satisfy several inequalities to reproduce the experimental results. The obtained parameter set, εCC2 = −0.5, εCN2 = −0.3 and εNN2 = −0.1−0.1 kcal/mol, implies the additivity of the adsorbate-adsorbate interaction.