Abstract The first direct observation of atomic exchange during the surface self-diffusion of single adatoms is reported. Iridium adatoms from a source enriched to ≥ 93% 191Ir was deposited onto an atomically clean and smooth Ir(100) plane as observed in a field ion microscope. Following thermally activated surface self-diffusion the adatom was field desorbed and mass analyzed. Detection of the 193Ir isotope in one-half of the cases demonstrates conclusively that atomic exchange can occur during surface self-diffusion.

中文翻译：

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表面自扩散过程中原子交换的直接观察

摘要 首次直接观察到单个吸附原子表面自扩散过程中的原子交换。如在场离子显微镜中所观察到的那样，来自富含≥ 93% 191Ir 的源的铱吸附原子沉积在原子级清洁且光滑的 Ir(100) 平面上。在热活化表面自扩散之后，吸附原子被场解吸并进行质量分析。在一半的情况下检测到 193Ir 同位素最终证明原子交换可以在表面自扩散过程中发生。