Abstract
Low energy alkali ion scattering, low energy electron diffraction (LEED) and Auger electron spectroscopy (AES) were used to study the adsorption of oxygen on the Mo 0.75Re 0.25(001) surface. Annealing to 1400 K in a limited coverage range produces a phase with chemisorbed oxygen and a structure characterized by a sharp p(2 × 1) LEED pattern. AES and ion scattering evidence indicates that the oxygen coverage is about 0.8 to 1.0 ML and shows that this structure contains vacancies ordered into missing rows. Oxygen atoms are adsorbed near three-fold hollow sites which result from the vacancy formation. Oxygen is found to induce loss of Re from the first and second layers in a thermally activated place exchange with Mo atoms. The structural features found are discussed and compared with previous results from oxygen adsorption on Mo(001) and W(001) surfaces and the effect of oxygen on the component depth profile is explained on the basis structural and thermodynamic stability.
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