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Superstructures of oxygen and sulphur on a Fe(110) surface via fast atom diffraction

机译:通过快速原子衍射在Fe(110)表面上的氧和硫的上层结构

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Fast helium atoms and hydrogen molecules with energies from 400 eV up to several keV are grazingly scattered from a Fe(110) surface covered by oxygen and sulphur atoms forming c(2 × 2) and c(1 × 3) superstructures, respectively. For scattering along low-index azimuthal directions we observe defined diffraction patterns in the angular distributions for scattered projectiles. From the evaluation of those diffraction patterns we derive the widths of low-indexed axial channels, the corrugation of the interaction potential across these channels, and the normal positions of adsorbed atoms above the Fe lattice. Our analysis is based on semiclas-sical models using hard-wall approximation as well as individual potentials for the interaction of projectiles with the surface. By comparing the results of different models, we discuss the robustness of the information on the geometrical structure of the surfaces.
机译:能量从400 eV到几keV的快速氦原子和氢分子从Fe(110)表面掠过散射,Fe(110)表面被氧和硫原子覆盖,分别形成c(2×2)和c(1×3)超结构。对于沿低折射率方位角方向的散射,我们观察到了散射弹丸在角度分布中定义的衍射图样。从这些衍射图样的评估中,我们得出了低折射率轴向通道的宽度,跨这些通道的相互作用势的波纹以及Fe晶格上方吸附原子的正常位置。我们的分析基于使用硬壁逼近的半经典模型以及弹丸与表面相互作用的单个势能。通过比较不同模型的结果,我们讨论了表面几何结构信息的鲁棒性。

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