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arXiv 2401.04794physics.chem-ph
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一种用于分子的降低成本四分量相对论性幺正耦合簇方法

A Reduced Cost Four-Component Relativistic Unitary Coupled Cluster Method for Molecules

Kamal Majee, Tamoghna Mukhopadhyay, Malaya K. Nayak, Achintya Kumar Dutta

AI总结:

本文提出分子四分量相对论性幺正耦合簇方法,通过Bernoulli展开构建qUCCSD与UCC3近似,并用自然旋量方案降低计算成本。

摘要:

我们提出了一种用于分子的四分量相对论性幺正耦合簇方法。我们采用基于对易子的非微扰近似,利用“Bernoulli展开”推导了相对论性幺正耦合簇方法的一种近似。文中报告了完整二次型幺正耦合簇单双激发方法(qUCCSD)以及一种微扰近似变体(UCC3)在能量和性质两方面的表现。可以看出,两种方法给出的结果均可与标准相对论性耦合簇方法相比拟。由于更好地纳入了弛豫效应,qUCCSD方法与实验结果表现出更好的一致性。文中还讨论了一种基于自然旋量的方案,用以降低相对论性UCC3和qUCCSD方法的计算成本。

英文摘要:

We present a four-component relativistic unitary coupled cluster method for molecules. We have used commutator-based non-perturbative approximation using the ''Bernoulli expansion'' to derive an approximation to the relativistic unitary coupled cluster method. The performance of the full quadratic unitary coupled-cluster singles and doubles method \left ( qUCCSD \right ), as well as a perturbative approximation variant \left ( UCC3 \right ), has been reported for both energies and properties. It can be seen that both methods give results comparable to those of the standard relativistic coupled cluster method. The qUCCSD method shows better agreement with experimental results due to better inclusion of the relaxation effects. A natural spinor-based scheme to reduce the computation cost of relativistic UCC3 and qUCCSD methods has been discussed.

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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