核心结合能量的计算:一种可扩展的方法,使用基于量子嵌入的运动方程合集群方法
Bhavnesh Jangid1, Matthew R Hermes1, Laura Gagliardi1,2
1Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States.
The journal of physical chemistry letters
|May 29, 2024
概括
密度矩阵嵌入理论加速了大型分子的核心电离能计算. 这种计算化学方法实现了高精度,使得以前无法使用标准技术的研究成为可能.
科学领域:
- 计算化学计算化学
- 量子化学 是一个量子化学.
- 分子建模分子建模
背景情况:
- 准确计算核心电离能 (IPs) 对于理解分子电子结构至关重要.
- 传统的高层计算方法,如运动方程合集群 (EOM-CC),与大分子的计算成本作斗争.
研究的目的:
- 研究密度矩阵嵌入理论与核心-价值分离 (CVS) 和EOM-CCSD*一起用于计算大型分子核心IP的有效性.
- 与非嵌入式方法相比,评估嵌入式方法的准确性和计算效率.
主要方法:
- 使用密度矩阵嵌入理论与核心-价值分离 (CVS) 近似.
- 使用的运动方程合集群单双与扰动三倍 (EOM-CCSD*) 理论水平.
- 为基准数据集和复杂的分子系统计算核心电离能,如 uracil hexamer,化富勒烯和叶绿素.
主要成果:
- 非嵌入式IP-CVS-EOM-CCSD*方法的IP值在实验值1 eV以内 (标准偏差约0.2 eV).
- 嵌入式变体显示系统错误的最小增加 (平均未签名错误为0.07 eV,std dev ~0.1 eV).
- 嵌入式方法提供了显著的计算加速 (数量级的数量级),使得在具有4000个基础函数的系统上进行计算.
结论:
- 密度矩阵嵌入理论提供了一个计算上可行的和准确的方法来确定大型分子的核心电离能.
- 这种方法显著扩大了可访问的分子系统的范围,用于高精度的电子结构计算.
- 开发的计算策略为研究复杂的化学和生物系统开辟了新的途径.
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
8.4K
05:51Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
Published on: July 19, 2019
6.2K
相关概念视频
Nuclear Binding Energy
12.4K
The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons...
12.4K
Hybridization of Atomic Orbitals II
32.2K
sp3d and sp3d 2 Hybridization
32.2K
The Quantum-Mechanical Model of an Atom
42.2K
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.
42.2K
Bond Energies and Bond Lengths
25.2K
Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break it, that is, the energy necessary to separate the bonded atoms. Separating any pair of bonded atoms requires energy — the stronger a bond, the greater the energy required to break it.
25.2K
Equilibrium Conditions for a Particle
1.1K
When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
1.1K
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
