Abstract
We have investigated the oxygen-induced lifting of the clock reconstruction using low-energy ion scattering, low-energy electron diffraction and work function change measurements. The structure was prepared by annealing Al films with initial coverages from 0.5 ML (monolayers) to larger than 1 ML at . This surface was determined to consist of a clock-rotated (001) Pd top layer above a mixed Al - Pd underlayer. Adsorption of oxygen on the surface at room temperature induces Al segregation and lifts the reconstruction to yield phase. Oxygen removal from the surface by higher-temperature annealing is accompanied by depletion of Al from the surface, recovering the reconstruction. The driving mechanism for the reversible phase transition process is discussed.
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