Dynamic study of W atoms and clusters on W (111) surfaces

T.Y. Fu; W.J. Weng; T.T. Tsong

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Dynamic study of W atoms and clusters on W (111) surfaces

机译：W（111）表面上W原子和簇的动态研究

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Using a field ion microscope, the diffusion behaviors and atomic processes of W atoms and clusters on W (111) surfaces were observed directly. The activation energy of W clusters diffusion on W (111) as a function of cluster size has an oscillatory and increasing behavior. But, the activation energy of a single W atom is especially high. The compact geometric structures are more stable and have higher activation energies of surface diffusion than structures with extra atoms at the periphery. Besides the terrace diffusion, other atomic processes such as the ascending, descending, detachment motion on W (111) surfaces were also observed. Unlike the general systems, their occurrence temperatures are quite near. These experimental results were used to discuss the formation mechanism of single atom W tips.

机译：使用场离子显微镜，直接观察了W原子和簇在W（111）表面的扩散行为和原子过程。 W团簇在W（111）上扩散的活化能随团簇大小的变化具有振荡和增加的行为。但是，单个W原子的活化能特别高。与在外围具有额外原子的结构相比，紧凑的几何结构更稳定并且具有更高的表面扩散活化能。除了阶跃扩散外，还观察到其他原子过程，例如W（111）表面的上升，下降，脱离运动。与一般系统不同，它们的发生温度非常接近。这些实验结果用于讨论单原子W尖端的形成机理。

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来源
《Applied Surface Science》 |2008年第23期|p.7831-7834|共4页
作者
T.Y. Fu; W.J. Weng; T.T. Tsong;
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作者单位

Department of Physics, National Taiwan Normal University, 88 sec. 4 Ting Chou Road, Taipei 116, Taiwan, ROC;

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原文格式 PDF
正文语种 eng
中图分类应用物理学;
关键词
field ion microscopy; single atom tip; surface thermodynamics; tungsten;

机译：场离子显微镜;单原子尖端;表面热力学;钨;

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Dynamic study of W atoms and clusters on W (111) surfaces

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