Adsorption kinetics and thermal desorption measurements for oxygen layers on graphite

Abstract

Adsorption kinetics and thermal desorption measurements of low-energy electron diffraction intensities are applied to extract information on coverages of structures occurring for oxygen layers physisorbed on the basal plane of graphite. The change in coverage required to compress the δ phase in other experiments on exfoliated graphite is most likely due to alternate-site adsorption, clustering, and/or intergranular condensation. The high-density ζ phase of oxygen previously studied by low-energy electron diffraction is found to be a monolayer structure. The exact structure of the bilayer ζ phase is not resolved.