在引导式嵌入中朝着"黄金标准"迈进
1Department of Chemistry, Chicago Center for Theoretical Chemistry, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, United States.
Journal of chemical theory and computation
|October 28, 2025
概括
我们使用引导嵌入 (BE2) 开发了一种计算效率高的Coupled Cluster Singles,Doubles和 Perturbative Triples (CCSD(T)) 方法. 这种方法准确计算大分子系统的相对能量,使以前由计算成本限制的常规应用成为可能.
科学领域:
- 量子化学是一种量子化学.
- 计算物理学的计算物理.
- 理论化学是一种理论化学.
背景情况:
- 结合集群单,双和扰乱三重 (CCSD) 是一种高度准确的量子化学方法.
- 传统的CCSD (T) 计算在计算上昂贵,限制了它们在小型系统中的应用.
- 基于碎片的方法为缩放相关波函数计算提供了一个潜在的解决方案.
研究的目的:
- 在Bootstrap嵌入 (BE2) 框架内实施和验证一个计算效率高的CCSDT密度矩阵评估.
- 为了加快CCSD的计算,使用轨道顺位对称.
- 为了使CCSD的准确和常规应用到更大的分子系统.
主要方法:
- 实施CCSD (T) 密度矩阵评估,与引导嵌入 (BE2) 框架集成.
- 使用轨道顺位对称的计算加速.
- 与规范的全电子CCSD (T) 计算进行基准测试,并使用内在原子轨道和预测原子轨道 (IAO + PAO) 分区.
主要成果:
- 与正规的CCSDT相比,BE2-CCSDT方法显著降低了计算成本.
- 获得了准确的相对能量,对无乙烯系统的基准计算显示了与系统大小的近线性缩放.
- 该方法在使用IAO + PAO分区时显示出对异构化的高准确性.
结论:
- 在大型系统中,BE2-CCSD (T) 方法为传统的CCSD (T) 提供了一个计算上可行的和准确的替代方案.
- 这项工作使得高精度的相关波函数方法能够在以前难以处理的分子系统中进行常规应用.
- 开发的框架为扩展量子化学中的基于碎片的相关方法奠定了基础.
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