LOW-ENERGY CARBON-DIOXIDE SCATTERING FROM PD(111) SURFACES

The interaction of carbon dioxide positive ions and neutral molecules with clean and potassium covered surfaces is studied by grazing incide nce scattering experiments using a time-of-flight (TOP) method. When s cattered off Pd surfaces, CO2+/0 projectiles with primary energies of 250-1500 eV are subject to charge exchange processes, which partly lea d to dissociation. Violent collisions are less destructive in this ene rgy range (E(perpendicular to) approximate to 2-12 eV). Potassium is a well known promoter in surface chemistry and causes an increase of di ssociation.