arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.00277physics.chem-ph
收藏

距离分离混合密度泛函理论与随机相近似的解析能矢

Analytical Energy Gradients in Range-Separated Hybrid Density Functional Theory with Random Phase Approximation

Bastien Mussard, Peter G. Szalay, János G. Ángyán

摘要:

在拉格朗日框架下,基于距离分离混合(RSH)方法的几种无规相位近似(RPA)相关总能量方法推导了分析力,该方法将短程交换相关能量的短程密度泛函近似与Hartree-Fock型长程交换和RPA长程相关结合起来。RPA的相关能已表示为环耦合簇双(rCCD)理论。所得到的分析梯度已实施和测试的简单分子和分子间电荷转移复合物的几何优化,其中分子间的相互作用预计有一个不可忽略的影响,甚至对单体的几何参数。

英文摘要:

Analytical forces have been derived in the Lagrangian framework for several random phase approximation (RPA) correlated total energy methods based on the range separated hybrid (RSH) approach, which combines a short-range density functional approximation for the short-range exchange-correlation energy with a Hartree-Fock-type long-range exchange and RPA long-range correlation. The RPA correlation energy has been expressed as a ring coupled cluster doubles (rCCD) theory. The resulting analytical gradients have been implemented and tested for geometry optimization of simple molecules and intermolecular charge transfer complexes, where intermolecular interactions are expected to have a non-negligible effect even on geometrical parameters of the monomers.

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。

↑