Institute of Physics, Maria Curie-Skłodowska University, Place M. Curie-Skłodowskiej 1, PL-20031 Lublin, Poland.
Phys Rev Lett. 2011 Jul 8;107(2):026101. doi: 10.1103/PhysRevLett.107.026101. Epub 2011 Jul 5.
One-dimensional diffusion along long atomic chains of the Si(553)-Au surface is studied with scanning tunneling microscopy. Ab initio calculations reveal aligned preferential adsorption sites between Si step edge atomic chain and double Au atomic chain on each terrace. At 220 K the Pb atoms hop between shallow potential basins forming a potential groove and move parallel to the atomic chains. By combining the results of measurements with the model calculations of the Pb atoms static energy on the Si(553)-Au surface the attempt frequency ν₀ is determined.
利用扫描隧道显微镜研究了 Si(553)-Au 表面沿长原子链的一维扩散。从头算计算揭示了 Si 阶跃边缘原子链和每个台面上双 Au 原子链之间的对齐优先吸附位。在 220 K 下，Pb 原子在浅势阱之间跳跃，形成势槽，并沿原子链平行移动。通过将测量结果与 Pb 原子在 Si(553)-Au 表面上的静态能量模型计算相结合，确定了尝试频率 ν₀。
