优化B97型密度函数近似,全球混合和距离隔离的混合能源函数与TAO-DFTT中的D4分散校正
Shaozhi Li1, Jeng-Da Chai1,2,3
1Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
Journal of chemical theory and computation
|September 29, 2025
概括
新的密度函数近似改进了多引用系统的计算. 热辅助占用密度函数理论 (TAO-DFT) 函数如TAO-ωB97X-D4为单个和多个引用系统提供了更好的准确性.
科学领域:
- 计算化学计算化学
- 量子化学 是一个量子化学.
- 材料科学 材料科学 材料科学
背景情况:
- 科恩-沙姆密度函数理论 (KS-DFT) 与多重参考系统进行斗争.
- 热辅助占用密度功能理论 (TAO-DFT) 是为了解决这些局限性而开发的.
- 对于复杂的电子结构来说,传统的功能常常会产生质量上的故障.
研究的目的:
- 在TAO-DFT中,提高密度函数近似 (DFAs),全球杂交 (GHs) 和范围分离杂交 (RSHs) 的性能.
- 引入重新优化的B97型函数与D4分散校正以提高精度.
- 开发一种有效的方法来计算TAO-DFT中的激发能.
主要方法:
- 通过对TAO-DFT (TAO-B97-D4,TAO-B97X-D4,TAO-ωB97X-D4) 进行D4分散校正,重新优化B97型的DFA,GH和RSH函数.
- 开发一个新的分析参数化,用于虚拟温度 θ.
- 在KS-DFT中通过限制 θ = 0 来提出KS-ωB97X-D4的建议.
- 在TAO-DFT中引入pTAO/TDA方法用于高效激发能计算.
主要成果:
- 新的功能 (TAO-B97-D4,TAO-B97X-D4,TAO-ωB97X-D4,KS-ωB97X-D4) 在各种单个和多个引用系统上进行了测试.
- 对热化学,动力学,非共价相互作用以及具有挑战性的解离和电荷转移过程的性能进行了评估.
- KS-ωB97X-D4显示了对单个参考系统属性的高精度.
- 在单个和多个引用系统中,TAO-ωB97X-D4表现出良好的性能.
结论:
- 重新优化的功能,特别是TAO-ωB97X-D4,显著改善了多参考系统的传统方法.
- 由于其平衡的性能,建议TAO-ωB97X-D4用于一般应用.
- 对于单个参考系统的属性,KS-ωB97X-D4具有很高的准确性.
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