Order-Disorder Transition and Adatom-Adatom Interactions in a Chemisorbed Overlayer: Oxygen on W(110)

Abstract

The intensity and angular width of superlattice reflections in low-energy electron diffraction from W(110)$p(2\mathrm{}\times 1)$-O are measured as the overlayer disorders. The width of the reflections increases with temperature, indicating a shrinking of island size. An adatom-adatom interaction energy is determined for this system by using a short-range-order model and calculating the diffracted intensity from a chain of atoms.