降低CCSD的成本 在Ab Initio计算热化学中进行基数集外推
James H Thorpe1, Peter R Franke2, John F Stanton2
1Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.
Journal of chemical theory and computation
|January 26, 2026
概括
我们为计算化学中的结合集群单双 (CCSD) 贡献提供了近似值. SDQ-MP4被提议作为一个具有成本效益的CCSD基础集中间体,用于亚化学准确性计算.
科学领域:
- 计算化学的计算化学
- 理论化学 理论化学
- 量子化学 是一个量子化学.
背景情况:
- 结合集群单双 (CCSD) 计算对于准确的理论预测至关重要.
- 为了降低计算成本,需要将CCSD的贡献进行近似计算.
- 像MP2这样的现有方法在准确性和适用性方面存在局限性.
研究的目的:
- 开发和评估CCSD对总原子化能量的贡献的近似值.
- 为了确定成本效益的基准集中介物,用于亚化学准确性计算.
- 提出新的方案,以使大型中央证券交易所的基本设置限制相近.
主要方法:
- 与HEAT+CH4测试套件进行基准测试的近似值.
- 评估MP2和SDQ-MP4作为基础集中间产品.
- 开发一个"类似CBS"的方案,将MP2和SDQ-MP4.4结合起来.
- 评估SDQ-MP4用于和基本频率计算.
主要成果:
- 对于某些准确度范围,MP2在没有经验缩放的情况下是有效的.
- SDQ-MP4在MP2上提供了显著的改进,以降低成本作为基础集中间件.
- 一个"类似于CBS"的方案提供了一个"廉价"的三部分近似的CCSD基础设置限制.
- 在频率计算中,SDQ-MP4显示了准确的零点校正的前景.
结论:
- 推SDQ-MP4作为实际上是CCSD基础集中间体,用于当CCSD无法负担时的亚化学准确性.
- 拟议的"类似于CBS的"计划使得CCSD基本设置限制的价格接近.
- SDQ-MP4使用复合方法方便准确的和基本频率计算.
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