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arXiv 2104.03556physics.chem-ph
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一个二阶CASSCF算法及双电子积分的Cholesky分解

A Second-Order CASSCF Algorithm with the Cholesky Decomposition of the Two-Electron Integrals

Tommaso Nottoli, Jürgen Gauss, Filippo Lipparini

摘要:

在这篇文章中,我们提出了一个二阶CASSCF算法的实施结合Cholesky分解的两个电子的排斥积分。该算法被称为范数扩展优化,保证了优化的收敛性,但它涉及波函数的完整Hessian,因此计算成本很高。耦合的二阶程序与Cholesky分解导致显着降低计算成本,减少内存需求,并提高并行性能。因此,CASSCF计算较大的分子系统成为可能,作为一个例行任务。通过对分子大小不断增加的基准计算来说明新实现的性能,具有高达约3000个基函数和14个活性轨道。

英文摘要:

In this contribution, we present the implementation of a second-order CASSCF algorithm in conjunction with the Cholesky decomposition of the two-electron repulsion integrals. The algorithm, called Norm-Extended Optimization, guarantees convergence of the optimization, but it involves the full Hessian of the wavefunction and is therefore computationally expensive. Coupling the second-order procedure with the Cholesky decomposition leads to a significant reduction in the computational cost, reduced memory requirements, and an improved parallel performance. As a result, CASSCF calculations of larger molecular systems become possible as a routine task. The performance of the new implementation is illustrated by means of benchmark calculations on molecules of increasing size, with up to about 3000 basis functions and 14 active orbitals.

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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