arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1208.3541physics.chem-phphysics.comp-ph
收藏

多组态杂化密度泛函理论

A multiconfigurational hybrid density-functional theory

Kamal Sharkas, Andreas Savin, Hans Jørgen Aa. Jensen, Julien Toulouse

摘要:

我们提出了一个多组态混合密度泛函理论,它严格地结合了多组态自洽场计算与密度泛函近似的基础上的线性分解的电子-电子相互作用。这给出了通常的混合近似的直接扩展,除了精确交换的分数λ之外,本质上还增加了精确静态相关的分数λ。用Perdew-Burke-Ernzerhof(PBE)和Becke-Lee-Yang-Parr(BLYP)密度泛函对臭氧与乙烯或乙炔的环加成反应以及双原子分子的解离进行了实验计算,结果表明,与通常的混合近似方法一样,λ取0.25比较合适。结果表明,所提出的多组态混合近似可以改善通常的密度泛函计算的情况下,具有较强的静态相关效应。

英文摘要:

We propose a multiconfigurational hybrid density-functional theory which rigorously combines a multiconfiguration self-consistent-field calculation with a density-functional approximation based on a linear decomposition of the electron-electron interaction. This gives a straightforward extension of the usual hybrid approximations by essentially adding a fraction λof exact static correlation in addition to the fraction λof exact exchange. Test calculations on the cycloaddition reactions of ozone with ethylene or acetylene and the dissociation of diatomic molecules with the Perdew-Burke-Ernzerhof (PBE) and Becke-Lee-Yang-Parr (BLYP) density functionals show that a good value of λis 0.25, as in the usual hybrid approximations. The results suggest that the proposed multiconfigurational hybrid approximations can improve over usual density-functional calculations for situations with strong static correlation effects.

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。

↑