基于结的自然轨道的合集群单,双,和 (全) 三倍 - - 一个计算研究
Manisha1, Prashant Uday Manohar1
1Department of Chemistry, BITS-PILANI, Pilani campus, Pilani, 333031, India.
Chemistry, an Asian journal
|June 6, 2025
概括
结自然轨道 (FNO) 方法扩展到配对集群与单元,双元和三元 (CCSDT) 计算,为计算化学提供了具有成本效益和准确的方法. 这一进步使得更大的分子系统能够进行高效的能量计算.
科学领域:
- 计算化学的计算化学
- 量子化学 是一个量子化学.
- 理论化学 理论化学
背景情况:
- 结自然轨道 (FNO) 方法提供了一种使用合集群 (CC) 方法计算分子能量的计算效率高的方法.
- 现有的FNO实现仅限于CC单双 (CCSD) 和运动方程CCSD (EOM-CCSD) 理论水平.
研究的目的:
- 将冷自然轨道 (FNO) 方法扩展到结合集群与单个,双重和三重 (CCSDT) 理论层面.
- 在Q-CHEM量子化学包中实施和评估FNO-CCSDT的性能.
- 探索FNO-CCSDT对各种分子性质和光谱参数的准确性和效率.
主要方法:
- 实施冷自然轨道 (FNO) 方法用于配对集群与单个,双重和三重 (CCSDT) 计算.
- 使用FNO-CCSDT的双精度 (DP) 和单精度 (SP) 算法.
- 对FNO-CCSDT结果进行推断,以获得XFNO-CCSDT方法以提高准确性.
- 计算的总能量,亚流动和垂直的三重单子间隙,以及估计的光谱参数 (力常数,振动频率).
主要成果:
- 证明了FNO-CCSDT方法的可行性和效率,用于准确的能源计算.
- 与使用水作为测试系统的传统CCSDT相比,展示了FNO-CCSDT的性能.
- 介绍了分子能量的结果,三-单差距和键拉伸趋势,突出了外推 XFNO-CCSDT 方法的准确性.
- 成功地应用了FNO-CCSDT用于二元原子分子中的光谱参数的数值估计.
结论:
- FNO方法已成功扩展到CCSDT层面,为准确和成本效益的量子化学计算提供了有价值的工具.
- FNO-CCSDT方法,包括其外推的XFNO-CCSDT变体,在不影响准确性的情况下,可显著提高计算效率.
- 这项工作为将高水平合集群理论应用于更大,更复杂的分子系统铺平了道路.
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