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arXiv 1503.05693physics.chem-phcond-mat.other
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沿绝热联系外推计算激发能

Calculating excitation energies by extrapolation along adiabatic connections

Elisa Rebolini, Julien Toulouse, Andrew M. Teale, Trygve Helgaker, Andreas Savin

摘要:

本文提出了一种替代距离分离线性响应依赖时间的密度泛函理论和微扰理论的方法,以改进从部分相互作用系统的能量估计物理系统的能量。从分析的泰勒展开的部分相互作用系统的能量的物理系统周围,我们使用外推方案,以提高估计的物理系统的能量在中间点的距离分离或线性绝热连接,其中电子-电子相互作用的缩放或仅包括库仑相互作用的长程部分。外推方案首先适用于氦和铍原子和氢分子在其平衡和拉伸几何的距离分离的能量。它显着提高了收敛速度的能量向其精确的限制相对于距离分离参数。距离分离的外推方案进行了比较与类似的方法的线性绝热连接,突出了每种方法的相对优势和劣势。

英文摘要:

In this paper, an alternative method to range-separated linear-response time-dependent density-functional theory and perturbation theory is proposed to improve the estimation of the energies of a physical system from the energies of a partially interacting system. Starting from the analysis of the Taylor expansion of the energies of the partially interacting system around the physical system, we use an extrapolation scheme to improve the estimation of the energies of the physical system at an intermediate point of the range-separated or linear adiabatic connection where either the electron--electron interaction is scaled or only the long-range part of the Coulomb interaction is included. The extrapolation scheme is first applied to the range-separated energies of the helium and beryllium atoms and of the hydrogen molecule at its equilibrium and stretched geometries. It improves significantly the convergence rate of the energies toward their exact limit with respect to the range-separation parameter. The range-separated extrapolation scheme is compared with a similar approach for the linear adiabatic connection, highlighting the relative strengths and weaknesses of each approach.

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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