预测原子轨道作为最佳虚拟空间,用于基于激发状态投影的嵌入计算
Ádám B Szirmai1,2, Bence Hégely3,4,5, Attila Tajti1
1Laboratory of Theoretical Chemistry, Institute of Chemistry, ELTE Eötvös Loránd University, P.O. Box 32, H-1518 Budapest, Hungary.
Journal of chemical theory and computation
|April 16, 2024
概括
投射原子轨道 (PAO) 技术通过创建更好的虚拟轨道来提高基于投射的嵌入 (PbE),从而为准确的量子化学计算提供更好的虚拟轨道. 这种方法提高了分子相互作用的嵌入方法的性能.
科学领域:
- 计算化学是一种计算化学.
- 量子力学就是量子力学.
- 电子结构理论 电子结构理论
背景情况:
- 基于投影的嵌入 (PbE) 方法对于大分子系统的准确计算至关重要.
- 虚拟轨道空间的构建显著影响了PbE方法的性能.
- 创建虚拟轨道的传统方法可能是计算密集的或不那么准确.
研究的目的:
- 介绍和评估用于在PbE中构建虚拟轨道空间的预测原子轨道 (PAO) 技术.
- 评估基于PAO的PbE对分子间潜力的性能,包括激发状态和Rydberg状态.
- 为了将PAO-PbE结果与传统的轨道定位技术和高水平的初始计算进行比较.
主要方法:
- 该研究介绍了一种使用PAO技术生成虚拟轨道的简单程序.
- 在基于投影的嵌入框架中应用PAO方案.
- 计算了双分子复合体的分子间潜力,包括基态和兴奋状态.
主要成果:
- 该PAO技术为高层嵌入计算提供了一组有效的虚拟轨道.
- 使用PAO虚拟轨道的PbE方法与使用局部轨道的方法相比,表现出色.
- 计算的PbE电位曲线与高层次的初始二次数计算非常一致,即使是分散的基础集.
结论:
- PAO技术是构建PbE中的虚拟轨道空间的强大而高效的方法.
- 基于PAO的PbE为电子结构计算提供了显著的精度和性能改进.
- 这种技术被推用于未来的应用,在计算化学中采用上下嵌入方法.
相关概念视频
Hybridization of Atomic Orbitals I
47.0K
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...
47.0K
Hybridization of Atomic Orbitals II
32.2K
sp3d and sp3d 2 Hybridization
32.2K
Atomic Orbitals
33.6K
An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
33.6K
Valence Bond Theory and Hybridized Orbitals
19.3K
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...
19.3K
The Energies of Atomic Orbitals
23.9K
In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
23.9K
Molecular Orbital Theory I
32.1K
Overview of Molecular Orbital Theory
32.1K


