准弹性He原子表面散射的随机描述 相互作用吸附质的动力学

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摘要翻译：
研究颗粒在金属表面的扩散和低频振动运动是至关重要的；它提供了关于吸附质-底物和底物-底物相互作用性质的有价值的信息。特别是，随着复盖率的增加，在扩散峰中观察到的实验展宽通常是通过Langevin框架内的广泛分子动力学计算来解释吸附质之间的偶极-类偶极相互作用。在这里，我们提出了另一种解释这种展宽的方法，用纯随机的描述，即相互作用的单吸附质近似，其中考虑了两个噪声源：（1）高斯白噪声反映了表面摩擦和温度，(2)白散粒噪声代替了吸附质之间的相互作用势。用标准Langevin数值模拟了平面和波纹表面（具有可分离势）的Na原子在Cu(100)表面上的动力学行为，这与假设高斯近似下由简单模型（自由粒子和非谐振子）得到的解析表达式很好地吻合。对于受挫折的平移模峰也预期有类似的展宽。
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英文标题：
《Quasielastic He atom scattering from surfaces: A stochastic description
  of the dynamics of interacting adsorbates》
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作者：
R. Martinez-Casado, J. L. Vega, A. S. Sanz, S Miret-Artes
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最新提交年份：
2007
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分类信息：

一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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一级分类：Physics        物理学
二级分类：Materials Science        材料科学
分类描述：Techniques, synthesis, characterization, structure.  Structural phase transitions, mechanical properties, phonons. Defects, adsorbates, interfaces
技术，合成，表征，结构。结构相变，力学性质，声子。缺陷，吸附质，界面
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一级分类：Physics        物理学
二级分类：Quantum Physics        量子物理学
分类描述：Description coming soon
描述即将到来
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英文摘要：
  The study of diffusion and low frequency vibrational motions of particles on metal surfaces is of paramount importance; it provides valuable information on the nature of the adsorbate-substrate and the substrate-substrate interactions. In particular, the experimental broadening observed in the diffusive peak with increasing coverage is usually interpreted in terms of a dipole-dipole like interaction among adsorbates via extensive molecular dynamics calculations within the Langevin framework. Here we present an alternative way to interpret this broadening by means of a purely stochastic description, namely the interacting single adsorbate approximation, where two noise sources are considered: (1) a Gaussian white noise accounting for the surface friction and temperature, and (2) a white shot noise replacing the interaction potential between adsorbates. Standard Langevin numerical simulations for flat and corrugated surfaces (with a separable potential) illustrate the dynamics of Na atoms on a Cu(100) surface which fit fairly well to the analytical expressions issued from simple models (free particle and anharmonic oscillator) when the Gaussian approximation is assumed. A similar broadening is also expected for the frustrated translational mode peaks.
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PDF链接：
https://arxiv.org/pdf/707.2335

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关键词：相互作用 动力学 Calculations interactions Experimental adsorbate 解析 解释 谐振子 分子