基于KS交换相关性潜力的混合KS DFT功能性的批判性评估
Vignesh Balaji Kumar1, Szymon Śmiga1, Ireneusz Grabowski1
1Institute of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University in Toruń, ul. Grudzia̧dzka 5, 87-100 Toruń, Poland.
我们开发了一种方法来评估密度函数理论 (DFT) 的混合函数. 高哈特里-福克交换混合物产生更好的Kohn-Sham潜力和电离潜力,指导新的功能发展.
科学领域:
- 量子化学 是一个量子化学.
- 计算材料科学科学 计算材料科学
- 理论化学 理论化学
背景情况:
- 密度函数理论 (DFT) 是现代计算化学和材料科学的基石.
- 混合交换相关 (XC) 密度函数近似 (DFAs) 提供了更好的准确性,但需要严格的评估.
- 评估混合DFAs的质量需要基本的物理量.
研究的目的:
- 建立一个评估混合XC-DFAs的关键方法.
- 通过使用基本性质来评估155个混合DFAs的质量.
- 为了确定高性能混合XC-DFAs的关键特征.
主要方法:
- 开发了一种新的方法来评估混合XC-DFAs.
- 通过反转自相一致的Kohn-Sham (KS) 电子密度来计算XC电位.
- 测试了155个混合DFA与完整配置交互 (FCI) 和合集群 (CCSD) 的参考数据进行了测试.
主要成果:
- 混合函数的子集,特别是那些具有高哈特里-福克交换的子集,产生精确的KSXC潜力.
- 计算的电离电位 (IP) 的质量与XC电位的准确性有很强的相关性.
- XC能量计算受到功能驱动错误的显著影响,影响电子密度.
结论:
- 高哈特里-福克交换内容对于开发精确的混合XC-DFAs至关重要.
- 开发的方法提供了一个新的框架,用于构建改进的KS-DFT功能.
- 这项工作为未来设计更可靠的计算化学工具提供了宝贵的见解.
更多相关视频
08:04Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
13:56Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
相关概念视频
Valence Bond Theory and Hybridized Orbitals
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
Hybridization of Atomic Orbitals I
Hybridization of Atomic Orbitals II
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Resonance and Hybrid Structures
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Valence Bond Theory
