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arXiv 1905.01014physics.chem-phphysics.comp-ph
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距离分离双杂化密度泛函理论的耦合团簇和无规相位近似

Range-separated double-hybrid density-functional theory with coupled-cluster and random-phase approximations

Cairedine Kalai, Bastien Mussard, Julien Toulouse

摘要:

我们构建了距离分离的双杂交方案,结合耦合集群或随机相位近似与密度泛函的基础上的双参数库仑衰减方法的电子-电子相互作用的分解。我们发现,在计算的波函数部分中加入一小部分短程电子-电子相互作用对于涉及具有交换项的随机相位近似的变体的距离分离双杂交方案是全局有益的。即使后者的计划是全球性的准确性,相应的计划只采用二阶M{M}ller-Plesset微扰理论的原子化能量,反应势垒高度,和弱分子间相互作用的小分子,它是更准确的更复杂的情况下的苯二聚体的堆叠配置。本范围分离的双杂交计划采用随机相位近似,因此代表了一个新的成员在家庭的双杂交与最小的双杂交,这可能是有用的一般化学应用。

英文摘要:

We construct range-separated double-hybrid schemes which combine coupled-cluster or random-phase approximations with a density functional based on a two-parameter Coulomb-attenuating-method-like decomposition of the electron-electron interaction. We find that the addition of a fraction of short-range electron-electron interaction in the wave-function part of the calculation is globally beneficial for the range-separated double-hybrid scheme involving a variant of the random-phase approximation with exchange terms. Even though the latter scheme is globally as accurate as the corresponding scheme employing only second-order M{ø}ller-Plesset perturbation theory for atomization energies, reaction barrier heights, and weak intermolecular interactions of small molecules, it is more accurate for the more complicated case of the benzene dimer in the stacked configuration. The present range-separated double-hybrid scheme employing a random-phase approximation thus represents a new member in the family of double hybrids with minimal empiricism which could be useful for general chemical applications.

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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