混合平面波和局部轨道基础的稀疏-静态混合时间依赖密度函数理论
Kyle Chen1, Barry Y Li1, Tucker Allen1
1Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095, United States.
Journal of chemical theory and computation
|August 20, 2025
概括
本研究引入了一种混合基数方法,用于使用时间依赖密度函数理论计算光学吸收光谱. 这种方法通过结合平面波和原子基础集来提高计算效率,加速光谱融合.
科学领域:
- 计算化学
- 理论化学
- 量子化学
背景情况:
- 精确计算光学吸收光谱对于理解分子电子性质至关重要.
- 使用平面波基集的传统方法在计算上可能很昂贵,特别是在大型系统中.
- 时间依赖密度函数理论 (TD-DFT) 是预测光谱的强大工具,但需要有效的实现.
研究的目的:
- 开发一种新的混合基数方法来计算光学吸收光谱.
- 提高TD-DFT计算的计算效率和加速光谱融合.
- 在这个新的框架下,能够有效地评估交易所的确切运营商.
主要方法:
- 使用一个通用的Kohn-Sham时间依赖密度函数理论 (TD-DFT) 框架.
- 使用混合基数方法:占用价值分子轨道 (MO) 使用平面波 (PW) 基数,而未占用MO使用局部原子基数函数.
- 该方法利用一个共同的真实空间网格来有效评估确切的交易所运营商.
主要成果:
- 与完全基于PW的模拟相比,混合基组方法显著加快了光谱收.
- 这样可以减少卡西达方程所需的空置MO数量的2-3倍.
- 这种方法在各种分子系统中展示了计算效率和化学直觉.
结论:
- 开发的混合基组方法为计算光学吸收光谱提供了高效和准确的方法.
- 这种方法在光谱收方面提供了显著的加速,使得TD-DFT计算更容易获得.
- 这种方法已在各种系统中得到验证,包括聚甲染料,芳和叶绿素.
相关概念视频
Hybridization of Atomic Orbitals I
48.9K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
48.9K
Valence Bond Theory and Hybridized Orbitals
21.4K
According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
21.4K
Hybridization of Atomic Orbitals II
33.7K
sp3d and sp3d 2 Hybridization
33.7K
Molecular Orbital Theory I
32.8K
Overview of Molecular Orbital Theory
32.8K
The Quantum-Mechanical Model of an Atom
44.3K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
44.3K
Molecular Orbital Theory II
19.7K
Molecular Orbital Energy Diagrams
19.7K


