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arXiv physics/0411104physics.chem-phphysics.atm-clus
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电子自洽性在基于TDDFT的非绝热分子动力学处理中的重要性

Importance of electronic self-consistency in the TDDFT based treatment of nonadiabatic molecular dynamics

T. A. Niehaus, D. Heringer, B. Torralva, Th. Frauenheim

摘要:

提出了一种模拟纳米分子系统中电子与原子核耦合动力学的量子-经典混合方法。该方法依赖于在适当的参考密度附近的含时密度泛函理论(TDDFT)中的拉格朗日的二阶展开。我们表明,包括二阶项呈现的方法是一个自洽的计划,并通过适当的处理耦合响应,提高了分子的计算光谱。在离子-富勒烯碰撞的应用中,发现包含自洽性对于正确描述射弹和靶之间的电荷转移至关重要。对视网膜蛋白质中的光感受器模型进行了非绝热分子动力学模拟,揭示了TDDFT在预测分子内电荷转移激发方面存在的问题。

英文摘要:

A mixed quantum-classical approach to simulate the coupled dynamics of electrons and nuclei in nanoscale molecular systems is presented. The method relies on a second order expansion of the Lagrangian in time-dependent density functional theory (TDDFT) around a suitable reference density. We show that the inclusion of the second order term renders the method a self-consistent scheme and improves the calculated optical spectra of molecules by a proper treatment of the coupled response. In the application to ion-fullerene collisions, the inclusion of self-consistency is found to be crucial for a correct description of the charge transfer between projectile and target. For a model of the photoreceptor in retinal proteins, nonadiabatic molecular dynamics simulations are performed and reveal problems of TDDFT in the prediction of intra-molecular charge transfer excitations.

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。

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