Analytic Molecular Hessian Calculations for CC2 and MP2 Combined with the Resolution of Identity Approximation.

Analytic Molecular Hessian Calculations for CC2 and MP2 Combined with the Resolution of Identity Approximation.
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CC2 和 MP2 的解析分子 Hessian 计算与身份近似解析相结合

DOI:
10.1021/ct400034t
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发表时间:
2013
影响因子:
5.5
通讯作者:
Jörg Koßmann
Jörg Koßmann
中科院分区:
化学1区
文献类型:
--
作者:
Daniel H. Friese;Christof Hättig;Jörg Koßmann

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给出了近似耦合簇单双模型CC2和二阶Møller-Plesset摄动理论(MP2)的解析二阶导数的实现。双电子排斥积分的RI近似用于减少内存需求、操作计数和I/O需求。在计算过程中,可以完全避免数量的存储(这是系统大小的度量)。结果表明,与B3LYP密度泛函相比,MP2方法对谐波频率进行适当的缩放可以更好地再现谐波频率,特别是C-F拉伸频率。具有强的内部范德华相互作用的分子也有类似的优势。自旋缩放在这些情况下提供了额外的改进。该实现已经对具有多达81个原子和684个基函数的分子进行了测试。
An implementation of analytic second derivatives for the approximate coupled cluster singles and doubles model CC2 and for second-order Møller–Plesset perturbation theory (MP2) will be presented. The RI approximation for the two-electron repulsion integrals is used to reduce memory demands, operation count, and I/O requirements. During the calculation, the storage ofquantities (whereis a measure for the system size) can completely be avoided. It is shown that with the MP2 method and an appropriate scaling of the harmonic frequencies, especially C–F stretch frequencies are reproduced much better in comparison to experiments than with the B3LYP density functional. Similar advantages are observed for molecules with strong, internal van der Waals interactions. Spin scaling offers additional improvements in these cases. The implementation has been tested for molecules with up to 81 atoms and 684 basis functions.
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