Subatomic resolution force microscopy reveals internal structure and adsorption sites of small iron clusters
Subatomic resolution force microscopy reveals internal structure and adsorption sites of small iron clusters
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DOI：
10.1126/science.aaa5329
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发表时间：
2015-04-17
期刊：
影响因子：
56.9
通讯作者：
Giessibl, Franz J.
中科院分区：
文献类型：
--
作者：
Emmrich, Matthias;Huber, Ferdinand;Giessibl, Franz J.
原子力显微镜（AFM）与亚原子分辨率的表面吸附（adatoms）从单个铁原子建立的集群进行了研究。单个铜和铁吸附原子表现为环形结构，多原子团簇表现为连接结构，每个原子表现为圆环。对于单个吸附原子，AFM图像的环形形状取决于吸附原子与底层结构的键合对称性[对于铜（110）上的铜为两倍，对于铜（111）上的铁为三倍]。密度泛函理论计算支持实验数据。这些发现纠正了我们以前的工作，其中AFM信号中的多个极小值被解释为单个前原子取向的反映，并表明力信号中的双重和三重极小值分别由二聚体和三聚体尖端引起。
Clusters built from individual iron atoms adsorbed on surfaces (adatoms) were investigated by atomic force microscopy (AFM) with subatomic resolution. Single copper and iron adatoms appeared as toroidal structures and multiatom clusters as connected structures, showing each individual atom as a torus. For single adatoms, the toroidal shape of the AFM image depends on the bonding symmetry of the adatom to the underlying structure [ twofold for copper on copper(110) and threefold for iron on copper(111)]. Density functional theory calculations support the experimental data. The findings correct our previous work, in which multiple minima in the AFM signal were interpreted as a reflection of the orientation of a single front atom, and suggest that dual and triple minima in the force signal are caused by dimer and trimer tips, respectively.