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arXiv 0709.1832cond-mat.mtrl-sci
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Pd(111)表面氢双空位的基态结构

Ground-state structure of the hydrogen double vacancy on Pd(111)

Sungho Kim, Seong-Gon Kim, S. C. Erwin

摘要:

我们测定了Pd(111)表面氢单层中双空位的基态结构。我们将双空位表示为含有一个额外的氢原子的三空位。利用密度泛函理论得到了氢原子在三重空位中运动的势能面,并通过求解薛定谔方程得到了全量子氢原子的波函数.我们发现双空位缺陷中的H原子经历了显著的量子效应,并且其基态波函数的中心在hcp位置,而不是Pd(111)上通常由H原子占据的fcc位置.我们的结果与扫描隧道显微镜图像吻合得很好。

英文摘要:

We determine the ground-state structure of a double vacancy in a hydrogen monolayer on the Pd(111) surface. We represent the double vacancy as a triple vacancy containing one additional hydrogen atom. The potential-energy surface for a hydrogen atom moving in the triple vacancy is obtained by density-functional theory, and the wave function of the fully quantum hydrogen atom is obtained by solving the Schrödinger equation. We find that an H atom in a divacancy defect experiences significant quantum effects, and that the ground-state wave function is centered at the hcp site rather than the fcc site normally occupied by H atoms on Pd(111). Our results agree well with scanning tunneling microscopy images.

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