Abstract
The formation of ordered oxygen overlayers on Pd(311) as well as the structures obtained after their reduction in hydrogen have been studied by He scattering. Exposure of the clean surface to oxygen at 110 K and subsequent annealing to 500 K leads to the formation of a well-ordered (2×4)pg structure. Oxygen removal from this phase by hydrogen at 320 K leads to the appearance of a (1×2)-reconstructed structure, which is metastable and reverts to the clean (1×1) surface at ∼370 K. The presence of a pronounced rainbow pattern in the (1×2) in-plane spectra signals unambiguously that its structure is of the missing-row type, suggesting that the reconstruction was induced by oxygen in the (2×4)pg phase. He diffraction data from the metastable (1×2) structure also suggest that significant unreconstructed (1×1) patches coexist with the missing-row reconstruction. Possible structural models for the (2×4)pg phase are also discussed.
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