Self-diffusion on reconstructed and nonreconstructed Ir surfaces

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Abstract
Using the field ion microscope, we have studied random walk diffusion of single Ir atoms and small Ir atomic clusters on Ir surfaces. On the (1×1) Ir {001} surface, diffusion of Ir adatoms occurs by an atomic replacement mechanism along the 〈001〉 directions. On the (1×1) Ir {110} surface, self-diffusion occurs by atomic hopping along the 〈110〉 directions and by atomic replacement along the 〈001〉 directions. On the (1×2) reconstructed Ir {110} surface, self-diffusion occurs only by atomic hopping along the doubly spaced [1̄10] surface channels. Within the experimental accuracy, the pre-exponential factors are all in the 10−3 cm2/s range. Energies needed for these atomic replacements and the barrier heights for these atomic hoppings are also derived. Diffusion of diatomic clusters on the (1×1) Ir {110} surfaces has also been studied.

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