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arXiv 1208.4388physics.chem-phcond-mat.other
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关联电子-核动力学:分子波函数的精确因式分解

Correlated electron-nuclear dynamics: Exact factorization of the molecular wavefunction

Ali Abedi, Neepa T. Maitra, E. K. U. Gross

摘要:

它最近显示[物理学。105,123002(2010)],在依赖于时间的外部势中演化的电子和核系统的完整波函数可以精确地分解为电子波函数和核波函数。精确含时势能面(TDPES)和精确含时矢势的概念自然地从形式主义中产生。在这里,我们提出了一个详细的描述的形式主义,包括一个完整的推导方程,电子和核波函数满足。我们证明了这种精确的因式分解传统的玻恩-奥本海默膨胀的关系。一个一维模型的H $_2^+$分子在激光场显示的实用性的确切TDPES解释耦合电子-核动力学:我们如何显示其结构的功能表明解离的机制。我们比较了精确的TDPES与含时Hartree方法的势能面,也比较了传统的Escherfest动力学与Escherfest动力学的精确TDPES。

英文摘要:

It was recently shown [Phys. Rev. Lett. 105, 123002 (2010)] that the complete wavefunction for a system of electrons and nuclei evolving in a time-dependent external potential can be exactly factorized into an electronic wavefunction and a nuclear wavefunction. The concepts of an exact time-dependent potential energy surface (TDPES) and exact time-dependent vector potential emerge naturally from the formalism. Here we present a detailed description of the formalism, including a full derivation of the equations that the electronic and nuclear wavefunctions satisfy. We demonstrate the relationship of this exact factorization to the traditional Born-Oppenheimer expansion. A one-dimensional model of the H$_2^+$ molecule in a laser field shows the usefulness of the exact TDPES in interpreting coupled electron-nuclear dynamics: we show how features of its structure indicate the mechanism of dissociation. We compare the exact TDPES with potential energy surfaces from the time-dependent Hartree-approach, and also compare traditional Ehrenfest dynamics with Ehrenfest dynamics on the exact TDPES.

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