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Time-resolved spectroscopy at surfaces and adsorbate dynamics: Insights from a model-system approach

机译:时间分辨光谱在表面和吸附动力学:模型系统方法的见解

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摘要

We introduce a model description of femtosecond laser induced desorption at surfaces. The substrate part of the system is taken into account as a (possibly semi-infinite) linear chain. Here, being especially interested in the early stages of dissociation, we consider a finite-size implementation of the model (i.e., a finite substrate), for which an exact numerical solution is possible. By time-evolving the many-body wave function, and also using results from a time-dependent density functional theory description for electron-nuclear systems, we analyze the competition between several surface-response mechanisms and electronic correlations in the transient and longer time dynamics under the influence of dipole-coupled fields. Our model allows us to explore how coherent multiple-pulse protocols can impact desorption in a variety of prototypical experiments.
机译:我们介绍了飞秒激光在表面引起的解吸的模型描述。系统的基材部分被视为(可能是半无限的)线性链。在这里,由于对解离的早期阶段特别感兴趣,我们考虑了模型的有限大小实现(即有限基体),对此可以实现精确的数值解。通过对多体波函数进行时间演化,并使用对电子核系统的时变密度泛函理论描述的结果,我们分析了瞬态和较长时间动力学中几种表面响应机制与电子相关性之间的竞争在偶极耦合场的影响下。我们的模型使我们能够探索相干的多脉冲协议如何在各种原型实验中影响解吸。

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  • 来源
    《Physical review》 |2016年第19期|195416.1-195416.11|共11页
  • 作者单位

    Mathematical Physics and ETSF, Lund University, Box 118, S-22100 Lund, Sweden;

    Synchrotron Radiation Research, Lund University, Box 118, S-22100 Lund, Sweden;

    Mathematical Physics and ETSF, Lund University, Box 118, S-22100 Lund, Sweden;

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