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arXiv 1804.03373physics.chem-phphysics.comp-ph
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通用的距离分离双杂交密度泛函理论

A general range-separated double-hybrid density-functional theory

Cairedine Kalai, Julien Toulouse

摘要:

本文提出了一种距离分离双混合(RSDH)方案,它是对距离分离混合和双混合方案的推广。该方案始终使用两个参数的库仑衰减方法(CAM)的电子-电子相互作用的分解交换和相关,以结合Hartree-Fock交换和二阶M{\displaystyle M}ller-Plesset(MP2)相关与密度泛函。RSDH方案依赖于一个精确的理论,这是在一些细节。几个半局域近似开发的短程交换相关密度泛函在这个计划中涉及。在找到CAM样分解的两个参数的最佳值后,RSDH方案被证明具有相对较小的基础依赖性,并提供原子化能量,反应势垒高度和弱分子间相互作用全球范围内更准确或可比的范围分离的MP2或标准MP2。RSDH方案代表了一个新的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:

A range-separated double-hybrid (RSDH) scheme which generalizes the usual range-separated hybrids and double hybrids is developed. This scheme consistently uses a two-parameter Coulomb-attenuating-method (CAM)-like decomposition of the electron-electron interaction for both exchange and correlation in order to combine Hartree-Fock exchange and second-order M{ø}ller-Plesset (MP2) correlation with a density functional. The RSDH scheme relies on an exact theory which is presented in some detail. Several semi-local approximations are developed for the short-range exchange-correlation density functional involved in this scheme. After finding optimal values for the two parameters of the CAM-like decomposition, the RSDH scheme is shown to have a relatively small basis dependence and to provide atomization energies, reaction barrier heights, and weak intermolecular interactions globally more accurate or comparable to range-separated MP2 or standard MP2. The RSDH scheme represents a new family of double hybrids with minimal empiricism which could be useful for general chemical applications.

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