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Phononic dissipation during 'hot' adatom motion: A QM/Me study of O-2 dissociation at Pd surfaces

机译:“热”Adatom运动期间发夹耗散:QM / ME研究PD表面O-2解离

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We augment ab initio molecular dynamics simulations with a quantitative account of phononic dissipation to study the non-equilibrium aftermath of the exothermic oxygen dissociation at low-index (111), (100), and (110) Pd surfaces. Comparing the hyperthermal diffusion arising from a non-instantaneous dissipation of the released chemical energy, we find a striking difference in the resulting "hot" adatom lifetime that is not overall reflected in experimentally recorded product end distances. We rationalize this finding through a detailed mode-specific phonon analysis and identify the dominant dissipation channels as qualitatively different groups of localized surface modes that ultimately lead to intrinsically different rates of dissipation to the Pd bulk. The thus obtained first-principles perspective on non-equilibrium adsorbate-phonon dynamics thereby underscores the sensitive dependence on details of the phononic fine structure, while questioning prevalent assumptions about energy sinks made in commonly used model bath Hamiltonians. Published by AIP Publishing.
机译:我们使用声音耗散的定量陈述增强了AB Initio分子动力学模拟,以研究低折射率(111),(100)和(110)Pd表面的放热氧解离的非平衡后。比较来自释放化学能的非瞬时耗散的超热扩散,我们发现所产生的“热”Adatom寿命中的显着差异,这些寿命并不整体反映在实验记录的产品端距离中。我们通过详细的特定模式的声子分析合理化该发现,并将主要耗散渠道识别为定性不同的局部表面模式组,最终导致对PD散装的本质上的耗散率。由此获得的第一原理对非平衡吸附性 - 声子动力学的透视图,从而强调了对声波细结构的细节的敏感依赖性,同时质疑常用模型浴室汉密尔顿人的能源汇的普遍假设。通过AIP发布发布。

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