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在时间依赖辅助密度函数理论中混合对角近似

Kevin O Pérez-Becerra1, Jesús N Pedroza-Montero2,3, Mark R Pederson3

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科学领域:

  • 计算化学
  • 理论化学
  • 量子化学

背景情况:

  • 时间依赖辅助密度函数理论 (TD-ADFT) 对电子结构计算具有计算效率.
  • 在量子化学中,准确计算垂直激发能量和振荡器强度至关重要.
  • 现有的方法可能面临复杂系统的计算成本限制.

研究的目的:

  • 为 TD-ADFT 引入和评估混合对角近似法.
  • 允许在 TD-ADFT 中使用全局和范围分离的混合功能.
  • 评估HDA在激发能量计算中的准确性和计算效率.

主要方法:

  • 在TD-ADFT框架内实施混合对角近似 (HDA).
  • 在TD-ADFT矩阵中仅包括精确交换的对角元素.
  • 单元和三元激发的垂直激发能量和振荡器强度的计算.

主要成果:

  • 该HDA的精度与单片激发的四中心电子排斥积分 (ERI) 方法相美.
  • 与传统的 ERI 实现相比,HDA 提供了显著的计算成本节约.
  • 与单片激发相比,三片激发的偏差较大.
  • 即使使用额外的积分计算,TD-ADFT的低序缩放也保持在HDA中.

结论:

  • 在TD-ADFT中,HDA提供了一种有效和准确的方法来计算单点激发能.
  • 该方法保留了TD-ADFT的计算优势,同时允许混合功能.
  • 可能需要进一步的研究来提高三倍激发的准确性.