Determination of atom positions at stacking-fault dislocations on Au(111) by scanning tunneling microscopy.
Determination of atom positions at stacking-fault dislocations on Au(111) by scanning tunneling microscopy.
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DOI：
10.1007/978-94-011-1812-5_15
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发表时间：
1989-04
期刊：
影响因子：
--
通讯作者：
C. Wöll;S. Chiang;R. Wilson;P. Lippel
中科院分区：
文献类型：
--
作者：
C. Wöll;S. Chiang;R. Wilson;P. Lippel
肖克利周围原子位置的确定。用原子分辨率的扫描隧道显微镜在金（23 × V ~ 3）表面层错重构的几个单位cens区域上观察到了金（11（））表面的10 ~（-1）型部分位错[Burgers矢量t（1，1，-2）]。数据直接显示了六方晶系和面心立方两种晶位在表面层的占据情况，验证了8种早期的重构模型，金是唯一一种面心立方（fcc）金属（III）表面重构，在单晶表面呈现重构现象的金属中占有独特的地位。Exr：用低能电子衍射（LEED）、反射高能电子衍射（RHEED）和氦原子散射（HAS）等方法，在Au（III）表面观察到（22± 1）个XV 3重构。在MoS 2上生长的小Au（III）片晶的透射电子显微镜（TEM）实空间图像揭示了两个。在重构的单胞内出现了明亮的条纹，这导致了表面原子重排的模型，该模型涉及面心立方型堆积（ABC）和六方密堆积（hcp）堆积的表面区域之间的有序边界阵列
The determination of atom positions around Shockley. type partial dislocations [Burgers vector t (1, 1,-2)] at the (\1 () surface of gold has been achieved by operating a scanning tunneling microscope with atomic resolution on regions containing several unit cens of the (23 X V3) stacking· fault reconstruction of this surface. The data show directly the occupation of both hexagonal· c1ose· packed and face-centered-cubic sites in the surface layer, verifyin8 earlier reconstruction models.Gold takes a unique place among the metals showing the phenomenon of reconstruction at single-crystal surfaces because it is the only face-centered-cubic (fcc) metal whose (III) surface reconstructs. Exr: riments using low-energy electron diffraction (LEED), reflection highenergy electron diffraction (RHEED), 2 and helium atom scattering (HAS») have observed a (22±l) XV3 reconstruction on Au (lll). Transmission electron microscope (TEM) real-space images of small Au (Ill) platelets grown on MoS2 revealed two. bright stripes within the reconstructed unit cell, leading to a model for the surface-atom rearrangement which involves an ordered array of boundaries between surface regions with fcc· type stacking (ABC) and hexagonal-close· packed (hcp) stacking