Structural determination of the unreconstructed and the reconstructed (110) surfaces of iridium

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Abstract
An Ir(110) – (1×1) surface has been prepared by adsorbing 1/4 monolayer of oxygen at 850 K on a clean, reconstructed (1×2) surface. Good agreement was achieved between theoretical and experimental intensity–voltage (I–V) spectra for a surface model in which the oxygen is randomly and uniformly distributed over the cyrstal surface, and the (1×1) structure is the same as for a clean unreconstructed (1×1) surface with a topmost interlayer spacing of 1.26±0.05 Å. Three different models have been tested for the reconstructed Ir(110) – (1×2) surface, namely, the missing-row model, the paired rows model, and the buckled surface model. Based on the comparison between experimental data (consisting of ten half-order beams and eight integral-order beams) and the theoretical calculations, the mising-row model with a topmost interlayer spacing of 1.22±0.07 Å is the most satisfactory model tested.

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