降低强电场电离化的TD-CI模拟的成本
Andrew S Durden1, H Bernhard Schlegel1
1Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.
The journal of physical chemistry. A
|August 23, 2024
概括
模拟强电场电离需要大量的计算资源. 本研究介绍了通过优化虚拟轨道选择在时间依赖的配置交互模拟中来降低计算成本的方法.
科学领域:
- 计算化学的计算化学
- 量子动力学 量子动力学是什么?
- 分子物理学 分子物理学
背景情况:
- 使用时间依赖的配置相互作用 (TD-CI) 与复杂的吸收潜力 (CAP) 的强场电离 (SFI) 模拟在计算上要求很高.
- 标准基础集需要分散的功能来进行CAP交互,随着分子大小的增加,模拟大小和成本也会增加.
- 有效的SFI模拟对于理解激光强度对激光场的分子反应至关重要.
研究的目的:
- 为了降低SFI的TD-CI模拟的计算成本.
- 为了优化在TD-CI计算中使用的虚拟轨道的选择.
- 为了提高模拟分子强场电离的效率.
主要方法:
- 使用旋转对称和轨道能量切断来限制虚拟轨道.
- 分析虚拟轨道与吸收潜力的相互作用及其离子化贡献.
- 利用二次扰动理论和激光适应的自然轨道来进行虚拟轨道选择.
主要成果:
- 与简单的能量切断相比,中性分子的虚拟轨道减少了20-35%,子减少了5-10%.
- 对于中性分子模拟,显著降低了35-60%的成本.
- 对于使用激光适应的自然轨道的子,进一步减少超过20%.
结论:
- 优化的虚拟轨道选择显著降低了SFI模拟中的计算成本.
- 基于吸收潜在相互作用和扰动理论的方法为简单的能量切断提供了有效的替代方案.
- 轨道的激光场适应提供了实质性的好处,特别是对于阴离子系统.
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