Structure and stress of Re(1121); chiral terraces at a racemic surface.

Structure and stress of Re(1121); chiral terraces at a racemic surface.
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Re(1121)的结构和应力;

DOI:
10.1039/c3cp53165a
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发表时间:
2013
期刊:
PCCP
影响因子:
--
通讯作者:
Etman HA
Etman HA
中科院分区:
--
文献类型:
--
作者:
Etman HA

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通过对多个入射角数据的低能电子衍射强度分析、扫描隧道显微镜和第一性原理密度函数计算,研究了清洁Re(111)表面的结构和形貌。结果表明,这种整体外消旋表面是如何终止于两个手性不同的阶地的,这些阶地表现出大规模的面外原子弛豫和最上层原子的面内横向运动。我们进一步确定并讨论了吸附氧的步进聚束的初始阶段,最终导致表面的大规模面化。最后,我们提出了表面应力的计算和对施加表面应变的响应,这表明了控制表面手性表达的途径。
The surface structure and morphology of the clean Re(111) surface has been investigated through combined low energy electron diffraction intensity analysis of data taken at multiple angles of incidence, scanning tunneling microscopy, and first-principles density functional calculations. The results show how this globally racemic surface terminates in two chirally distinct terraces, which show large-scale out-of-plane atomic relaxations and in-plane lateral movement of the uppermost atoms. We further identify and discuss the initial stages of step bunching upon adsorption of oxygen that leads ultimately to the large-scale faceting of the surface. Finally, we present calculations of surface stress and the response to applied surface strain, which suggest routes to the exertion of control over the expression of chirality at the surface.
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