Determination of the atomic arrangement of the unreconstructed Ir (110) surface by low-energy electron diffraction a

An Ir(110)-(1 × 1) surface structure has been prepared by adsorbing $\text{1}\text{4}$ monolayer of oxygen at 850 K on a clean, reconstructed (1 × 2) surface. Results of the low-energy electron diffraction structure analysis reveal that the oxygen is probably distributed randomly over the crystal surface, and the (1 × 1) structure is the same as a clean unreconstructed (1 × 1) structure, with a topmost interlayer Ir spacing of 1.26 ± 0.05 Å. This is equivalent to a contraction of approximately 7.5% of the bulk interlayer spacing of 1.36 Å.