Abstract
The influence of about a monolayer coverage of Pd, Au and oxygen on the structural stability of the Mo(111) surface has been studied under ultrahigh vacuum (UHV) using X-ray photoemission spectroscopy (XPS), Auger electron spectroscopy (AES), temperature programmed thermal desorption spectroscopy (TDS) and low energy electron diffraction (LEED). Pd and oxygen are found to induce the formation of [lcub]112[rcub] and [lcub]447[rcub] oriented facets respectively on the substrate surface. Both surfaces undergo a reversible “faceted/planar” phase transition at higher temperatures and the transition shows intrinsic hysteresis in both cases. With Au coverage, the precisely oriented Mo(111) surface is stable, whereas the vicinal surfaces can be induced to form a mixture of [lcub]112[rcub] facets and the original (111) surface. The implication of these results to the existing conjectures about the mechanism of adsorbate-induced faceting is discussed.
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