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排名减少的运动方程合集群形式主义,完全包含三重激发

Piotr Michalak¹, Michał Lesiuk¹

¹Faculty of Chemistry, University of Warsaw, Pasteura 1, Warsaw 02-093, Poland.

The journal of physical chemistry. A

|November 12, 2025

概括

我们介绍了一种降级的运动方程合集群理论,可以显著降低电子结构计算的计算成本. 这种方法提供了一种更有效的方法来研究分子激发状态.

科学领域:

计算化学计算化学
量子化学是一个量子化学.
理论化学理论化学

背景情况:

规范式运动方程合集群 (EOM-CC) 方法虽然准确,但在计算上昂贵,限制了它们对更大的系统的应用.
精确计算分子激发状态对于理解光化学,光谱学和材料特性至关重要.

研究的目的:

开发一个等级降低的变体的运动方程合集群理论与单,双,三次激发 (EOM-CCSDT).
为了降低EOM-CCSDT计算的计算成本和存储要求,同时保持激发状态的高精度.

主要方法:

塔克分解应用于基态和兴奋态的三倍兴奋幅度张量.
利用系统大小 (N) 的分解幅度的线性缩放来实现N^6的计算成本和N^4的存储.
系统地调查各种分子系统和兴奋状态特征的准确性和性能.

主要成果:

与正规方法相比,降级EOM-CCSDT方法显示了显著降低的计算成本和存储需求.
降级方法中引入的错误大大小于母理论中固有的错误.
对二元和NH3-F2复合物的计算显示了各种激发状态的精确潜在能量曲线和光谱参数.

结论:

拟议的降级EOM-CCSDT形式主义为研究分子激发状态提供了一个计算上可行的和准确的方法.
该方法的准确性可以通过单个参数来调整,在限制的情况下可以恢复正典方法.
这种方法为将高水平合集群理论应用于更大,更复杂的化学系统开辟了道路.

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