模拟强电场电离的分散基础集的评估,使用时间依赖的配置与复杂的吸收潜力的相互作用来进行模拟.
Andrew S Durden1, H Bernhard Schlegel1
1Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.
The journal of physical chemistry. A
|April 2, 2025
概括
研究人员优化了模拟强电场电离 (TDCI-CAP) 的扩散基数组. 确定s,p,d和f函数的特定指数,以准确建模角离子化依赖.
科学领域:
- 量子化学 是一个量子化学.
- 原子和分子物理 原子和分子物理
- 计算化学计算化学
背景情况:
- 模拟强电场电离需要增加具有扩散函数的标准基础集.
- 之前的研究使用了各种扩散函数,但它们对分子系统和角度依赖的有效性并没有完全优化.
- 在分子计算中出现线性依赖,原因是邻近中心的分散函数重叠.
研究的目的:
- 评估和优化扩散高斯基数组,以准确模拟强电场电离.
- 为了确定扩散s,p,d和f函数的最佳指数,用于建模电离化的角度依赖.
- 为单中心和分子系统评估这些优化的基础集的性能.
主要方法:
- 采用了与复杂吸收电位 (TDCI-CAP) 方法的时间依赖的配置相互作用.
- 测试了具有均指数的各种分散高斯函数集.
- 使用分层方法来构建和评估分子模拟的基础集,从最小集开始并逐渐添加函数.
主要成果:
- 对于单中心病例来说,辐射最大值在吸收潜力的开始附近的扩散函数是最重要的.
- 发现扩散的s,p,d和f函数的优化指数分别为0.0032,0.0032,0.0064和0.0064,或更小.
- 对于像氧气这样的负电子原子,需要额外的紧张 f 函数.
- 优化的扩散基集在静态和动态 (7周期脉冲) 强电场电离方面表现良好.
结论:
- 已开发的扩散基数集的层次结构准确地重现了强电场电离的速率和角度依赖.
- 优化的指数为未来的TDCI-CAP模拟分子电离的可靠指南.
- 这些发现适用于静态和时间依赖的强电场电离场景.
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