对中型分子的相对论两组件合集群方法的基于Cholesky分解的实现
Chaoqun Zhang1, Filippo Lipparini2, Stella Stopkowicz3,4
1Department of Chemistry, the Johns Hopkins University, Baltimore, Maryland 21218, United States.
Journal of chemical theory and computation
|January 10, 2024
概括
介绍了一种使用巧尔斯基分解 (CD) 进行相对论合集群 (CC) 计算的新计算方法. 这种方法可以准确研究中型分子,包括化合物,提高复杂化学系统的计算效率.
科学领域:
- 计算化学计算化学
- 量子化学 是一个量子化学.
- 相对论量子力学相对论量子力学
背景情况:
- 合集群 (CC) 和运动方程CC (EOM-CC) 方法是电子结构计算的强大工具.
- 对于像这样的重元素来说,相对论效应至关重要.
- 现有的方法可能对中型分子具有计算要求.
研究的目的:
- 开发和实施基于Cholesky分解 (CD) 的方法,用于相对论的双组分CC和EOM-CC方法.
- 将这些方法的适用性扩展到中型分子.
- 评估新实施的准确性和效率.
主要方法:
- 使用精确的两组分哈密尔顿式与原子平均场旋转轨道积分 (X2CAMF方案) 实现相对论两组分CC和EOM-CC.
- 利用基于原子轨道的算法来绕过构建具有高虚拟指数的两电子积分和中间体的需求.
- 采用乔莱斯基分解法,以高效地处理积分和中间值.
主要成果:
- 基于CD的X2CAMF-CC和EOM-CC方法可以关联大约1000个旋转子,将适用性扩展到中型分子.
- 含有的分子的基准计算表明,Cholesky值10-4保持了化学准确性.
- 通过计算UF6的键解离能和化离子的激发能来证明这种能力.
结论:
- 基于CD的实现为相对论CC和EOM-CC计算提供了一种高效和准确的方法.
- 这种方法显著提高了研究涉及重元素的复杂系统的能力.
- 该方法在化学准确性方面得到了验证,并且对计算化学的未来应用具有前景.
相关概念视频
Reduced Mass Coordinates: Isolated Two-body Problem
1.3K
In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
1.3K
Molecular Orbital Theory II
19.2K
Molecular Orbital Energy Diagrams
19.2K
Molecules with Multiple Chiral Centers
11.7K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
11.7K
¹H NMR: Complex Splitting
1.3K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.3K
π Electron Effects on Chemical Shift: Overview
1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K
Coupled Reactions
7.7K
Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions.
Energy in adenosine triphosphate or ATP molecules is easily accessible to do work. ATP powers the majority of energy-requiring cellular reactions....
Energy in adenosine triphosphate or ATP molecules is easily accessible to do work. ATP powers the majority of energy-requiring cellular reactions....
7.7K


