对于X射线吸收光谱的时间依赖密度功能理论:比较实时方法与线性响应
John M Herbert1,2, Ying Zhu1,2, Bushra Alam1
1Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States.
对于X射线吸收光谱的实时时间依赖密度函数理论 (TDDFT) 模拟可以被连续性过渡污染. 一种过技术可以恢复有意义的光谱,而传统的线性响应TDDFT仍然没有文物,并且更有效.
科学领域:
- 计算化学的计算化学
- 量子力学就是量子力学.
- 频谱学是一种光谱学.
背景情况:
- 时间依赖密度函数理论 (TDDFT) 是模拟X射线吸收光谱的强大工具.
- 存在两种表述:传统的线性响应和明确的时间依赖 (实时).
- 实时TDDFT提供宽带计算,没有核心/价值区分,但可能会引入文物.
研究的目的:
- 为了比较实时和线性响应TDDFT的准确性和效率,用于模拟X射线吸收光谱.
- 在实时TDDFT模拟中识别和解决文物.
- 在TDDFT计算中评估核心/价值分离的必要性.
主要方法:
- 在元素K边缘的X射线吸收光谱的模拟,使用实时和线性响应TDDFT.
- 从实时 TDDFT 中连续过渡的光谱污染的分析.
- 开发和应用一种过技术来分解光谱.
- 两个TDDFT方法之间的计算效率的比较.
主要成果:
- 实时TDDFT光谱经常受到连续性过渡的污染,特别是在三次-ζ基础集.
- 由于二极振荡器强度很大,这些文物可以掩盖光谱解释.
- 一种过技术成功地恢复了有意义的光谱,并将不同元素和边缘的贡献分开.
- 线性响应 TDDFT 避免了这些缺陷,并且在计算上更高效.
结论:
- 虽然实时TDDFT可以用于评估核心/值分离近似值,但线性响应TDDFT通常是准确和高效的X射线吸收光谱模拟的首选.
- 过技术对于解释实时TDDFT频谱至关重要.
- 基准组的选择显著影响了实时TDDFT中连续过渡工件的严重性.
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