金属表面吸附物与超热电子相互作用的量子修正朗之万动力学
Quantum corrected Langevin dynamics for adsorbates on metal surfaces interacting with hot electrons
摘要:
我们调查的重要性,包括量子化的初始条件,在朗之万动力学吸附与热库的电子相互作用。对于二次势的时间演化是精确描述的经典朗之万方程,它示出了如何严格获得量子力学的概率从经典的相空间分布产生的动力学。在短时间尺度下,经典和准经典的初始条件导致错误的结果,只有正确的量子化初始条件给出了一个密切的协议与固有的量子力学主方程的方法。以CO在Cu(100)表面上的吸附为例,研究了具有从头计算摩擦张量和势能面的体系的量子化效应,并表明量子化初始条件对分子的脱附几率和振动态分布都有很大的影响.
英文摘要:
We investigate the importance of including quantized initial conditions in Langevin dynamics for adsorbates interacting with a thermal reservoir of electrons. For quadratic potentials the time evolution is exactly described by a classical Langevin equation and it is shown how to rigorously obtain quantum mechanical probabilities from the classical phase space distributions resulting from the dynamics. At short time scales, classical and quasiclassical initial conditions lead to wrong results and only correctly quantized initial conditions give a close agreement with an inherently quantum mechanical master equation approach. With CO on Cu(100) as an example, we demonstrate the effect for a system with ab initio frictional tensor and potential energy surfaces and show that quantizing the initial conditions can have a large impact on both the desorption probability and the distribution of molecular vibrational states.
机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。