来自运动方程冷对型合集群方法的电子亲缘关系及其依赖单个激发,分子轨道和基数大小的依赖
Saman Behjou1, Paweł Tecmer1, Katharina Boguslawski1
1Institute of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University in Torun, Grudziądzka 5, Toruń 87-100, Poland.
Journal of chemical theory and computation
|October 6, 2025
概括
我们开发了新的计算方法来准确计算电子亲和力和开放电子结构. 这些冷对合集群方法提供了高精度,降低了大分子的计算成本.
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:
- 精确计算电子亲和度 (EA) 和开电子结构对于理解分子性质至关重要.
- 现有的方法在计算上可能很昂贵,限制了它们在大型分子系统中的应用.
研究的目的:
- 引入和评估新的电子亲和力运动方程冷对合集群 (EA-EOM-fpCC) 方法.
- 评估这些用于计算EA和开放系统的新方法的准确性和效率.
- 为了将EA-EOM-fpCC方法与既定的计算方法和实验数据进行比较.
主要方法:
- 开发其他EA-EOM-fpCC方法.
- 与参考 Δ-CCSD (T) 和实验数据进行比较.
- 使用自然对合集群双重 (pCCD) 轨道和各种基础集.
- 与正规合集群 (CC) 方法和电离潜力 (IP/DIP-EOM-CC) 方法进行比较.
主要成果:
- 在保持高精度的同时,EA-EOM-fpCC方法显著降低了计算成本.
- IP/DIP-EOM-fp(L) CCSD模型表现出色,与实验结果相比,EA的平均误差为0.09 eV.
- 欧亚-EOM-fpCCD显示了与 Δ-CCSD 的参考数据最接近的协议.
- 对于IP/DIP-EOM-fpCC计算,不建议使用扩散函数,对于具有大基数集的EA-EOM-fpCC来说,这些函数是不必要的.
结论:
- 冷对合集群方法为研究电子亲缘关系和开放系统提供了有效和准确的策略.
- IP/DIP-EOM-fp(L) CCSD模型是预测电子亲和力的高效方法.
- 仔细考虑基础集和分散函数对于优化EA计算很重要.
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