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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Effective fragment molecular orbital method: A merger of the effective fragment potential and fragment molecular orbital methods
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Effective fragment molecular orbital method: A merger of the effective fragment potential and fragment molecular orbital methods

机译:有效片段分子轨道方法:有效片段势和片段分子轨道方法的合并

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摘要

We present a new method called the effective fragment molecular orbital (EFMO) method. The EFMO method is a hybrid between the fragment molecular orbital (FMO) electronic structure method (Kitaura, K.; Ikeo, E.; Asada, T.; Nakano, T.; Uebayasi, M. Chem. Phys. Lett. 1999, 313, 701 -706) and the effective fragment potential multipole-based polarizable force field (Day, P. N.; Jensen, J. H.; Gordon, M. S.; Webb, S. P.; Stevens, W. J.; Krauss, M.; Garmer, D.; Basch, H.; Cohen, D. J. Chem. Phys. 1996, 105, 1968-1986). The EFMO method is based on the FMO molecular fragmentation scheme and the many-body energy expression but uses the EFP multipole-based energy expressions for long-range interactions and for evaluating the many-body polarization. The accuracy and performance of the EFMO method is compared to FMO and conventional electronic structure theory for water clusters. The difference in the EFMO energy compared to that of conventional Hartree-Fock theory is roughly 0.5 kcal/mol per hydrogen using the 6-31G(d) basis set but less than 0.1 kcal/mol using the 6-31+G(d) basis set. The EFMO method is roughly two times faster than the FMO2 method using Hartree-Fock and five times when computing Hartree-Fock energy and gradients; preliminary density functional theory results are also presented.
机译:我们提出了一种称为有效片段分子轨道(EFMO)方法的新方法。 EFMO方法是碎片分子轨道(FMO)电子结构方法之间的混合体(Kitaura,K .; Ikeo,E .; Asada,T .; Nakano,T .; Uebayasi,M.Chem.Phys.Lett.1999, 313,701 -706)和有效片段势基于多极的极化力场(Day,PN; Jensen,JH; Gordon,MS; Webb,SP; Stevens,WJ; Krauss,M .; Garmer,D .; Basch, H.; Cohen,DJ Chem.Phys.1996,105,1968-1986)。 EFMO方法基于FMO分子裂解方案和多体能量表达,但使用基于EFP多极子的能量表达进行远程相互作用和评估多体极化。将EFMO方法的准确性和性能与FMO和用于水团簇的常规电子结构理论进行了比较。与传统的Hartree-Fock理论相比,EFMO能量的差异在使用6-31G(d)基组的情况下大约为每氢0.5 kcal / mol,但是在使用6-31 + G(d)的情况下小于0.1 kcal / mol。基础集。 EFMO方法大约比使用Hartree-Fock的FMO2方法快两倍,是计算Hartree-Fock能量和梯度时的五倍;还介绍了初步的密度泛函理论结果。

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