A photoemission and thermal desorption study of carbon monoxide and oxygen adsorbed on platinum

Abstract

We have studied the changes in the photoelectron spectra of platinum (for photon energies of 21.2 and ⩽ 10.2 eV), in conjunction with thermal desorption experiments, for coverages of carbon monoxide and oxygen of up to ~0.25 monolayer (saturation coverage at room temperature). Based on a comparison of the photoemission and thermal desorption results, we suggest that the less tightly bound of the two adsorption states observed in the thermal desorption data is due to adsorbate-adsorbate interactions. We further suggest that a relatively delocalized chemisorption bond plays an important role in this interaction.