该eXact积分简化了时间依赖密度函数理论 (XsTD-DFT).
Marc de Wergifosse1,2, Stefan Grimme2
1Theoretical Chemistry Group, Molecular Chemistry, Materials and Catalysis Division (MOST), Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Place Louis Pasteur 1, B-1348 Louvain-la-Neuve, Belgium.
The Journal of chemical physics
|May 28, 2024
概括
一种新的计算方法,eXact积分简化时间依赖密度函数理论 (XsTD-DFT),准确地预测分子性质. 这种无参数的方法大大降低了大型系统的计算成本,使化学领域的应用更广泛.
科学领域:
- 量子化学 是一个量子化学.
- 计算化学计算化学
- 理论化学 理论化学
背景情况:
- 简化的时间依赖密度函数理论 (sTD-DFT) 提供了计算效率,但需要对积分进行近似.
- 精确预测激发状态和非线性光学特性对于材料科学和药物发现至关重要.
研究的目的:
- 介绍和验证eXact积分简化时间依赖密度函数理论 (XsTD-DFT) 方法.
- 基准XsTD-DFT与已建立的激发状态和非线性响应特性方法进行比较.
- 评估 XsTD-DFT 对大型分子系统的计算效率和可扩展性.
主要方法:
- 通过将sTD-DFT中的半实证积分替换为精确的1和2中心积分,开发了XsTD-DFT.
- 对77个分子的紫外线/Vis吸收,第一次超极化和两光子吸收 (2PA) 的评价性能.
- 将XsTD-DFT结果与时间依赖密度函数理论 (TD-DFT) 和sTD-DFT数据进行比较.
主要成果:
- XsTD-DFT/B3LYP激发能量与TD-DFT的偏差最小 (0.14 eV),计算成本降低了20倍以上.
- 激发能量的精度随着系统大小的增加而增加,这表明它适用于大型分子.
- 在刺激能量和振荡器强度方面,XsTD-DFT改进了sTD-DFT,特别是在电荷转移状态方面,并准确地复制了超极化和2PA光谱.
结论:
- XsTD-DFT提供了TD-DFT的准确性,而计算成本只占计算成本的一小部分.
- 无参数性质和效率使XsTD-DFT成为大型系统和高通量选的理想选择.
- 这种方法为研究复杂的分子系统和设计新材料开辟了新的途径.
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