对大型分子全电子激发状态计算的高斯基数组
Rémi Pasquier1, Maximilian Graml1, Jan Wilhelm1
1Institute of Theoretical Physics and Regensburg Center for Ultrafast Nanoscopy (RUN), University of Regensburg, 93053 Regensburg, Germany.
Journal of chemical theory and computation
|December 22, 2025
概括
我们开发了新的增强的MOLOPT基础集,用于在大分子中的兴奋状态计算. 这些基础集使电子属性的准确和高效计算成为可能,大大降低了计算成本.
科学领域:
- 计算化学计算化学
- 量子化学 是一个量子化学.
- 材料科学 材料科学 材料科学
背景情况:
- 精确的兴奋状态计算对于理解分子性质至关重要.
- 现有的基础集往往在大型系统的收和数值稳定性方面扎.
- 优化激发状态计算的基础集是计算要求很高的.
研究的目的:
- 引入一个全电子高斯基数组的新家族,增强了MOLOPT.
- 优化这些基础集,以对大分子进行高效和准确的激发状态计算.
- 确保电子财产预测的数值稳定性和快速融合.
主要方法:
- 增加现有的地面状态优化基础集 (STO-3G,STO-6G,MOLOPT).
- 评估GW间隙和贝特-萨尔佩特激发能量的融合.
- 通过重叠矩阵条件数来评估数值稳定性.
主要成果:
- 增强的 MOLOPT 基础集显示了 GW 差距和 Bethe-Salpeter 激发能量的快速收.
- 双ζ增强的MOLOPT基础实现了GW HOMO-LUMO差距的60 meV MAD到GW HOMO-LUMO差距的完全基础设置限制.
- 对于时间依赖密度函数理论和贝特-萨尔佩特方程方法来说,基数集收是可比的.
- 在大型纳米基因 (9224个原子) 上使用最小的增强基础集 (aug-SZV-MOLOPT-ae-mini) 用34300个核心小时,证明了GW计算.
结论:
- 增强的MOLOPT基础集为激发状态计算提供了显著的进步.
- 这些基础集提供了准确性,效率和数值稳定的平衡.
- 能够对复杂的分子系统进行大规模的GW和Bethe-Salpeter方程计算.
相关概念视频
Electronic Structure of Atoms
27.7K
An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
27.7K
Molecular Orbital Theory II
26.7K
Molecular Orbital Energy Diagrams
26.7K
VSEPR Theory
13.7K
Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
13.7K
Molecular Orbital Theory I
46.6K
Overview of Molecular Orbital Theory
46.6K
Hybridization of Atomic Orbitals I
65.1K
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...
65.1K
Structure of Benzene: Molecular Orbital Model
11.8K
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
11.8K


