相关实验视频
Updated: Jun 9, 2025
10:37
Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
8.9K
在极声合集群理论中的图表
Laurenz Monzel1, Stella Stopkowicz1,2
1Fachrichtung Chemie, Universität des Saarlandes, Campus B2.2, D-66123 Saarbrücken, Germany.
The journal of physical chemistry. A
|October 23, 2024
概括
我们引入了一个新的图形符号来导出量子电动力学合集群 (QED-CC) 方程用于极子状态. 这种方法概括了现有的合集群理论来计算分子性质.
科学领域:
- 量子化学 是一个量子化学.
- 理论化学 理论化学
- 频谱学是一种光谱学.
背景情况:
- 标准电子合集群 (CC) 理论是电子结构计算的强大工具.
- 量子电动力学 (QED) 描述了光与物质之间的相互作用,对于理解像极子子这样的现象至关重要.
- 现有的方法可能无法完全捕捉QED-CC系统中复杂的相互作用.
研究的目的:
- 开发一个通用的图表符号来导出量子电动学合集群 (QED-CC) 方程.
- 为了能够准确地描述极子基和兴奋状态.
- 为了方便在QED-CC框架内计算分子性质.
主要方法:
- 标准电子CC图形符号的通用化.
- 导出QED-CC和QED-运动方程CC (QED-EOM-CC) 的方程.
- 介绍CC兰巴达方程和减少密度矩阵的图表.
主要成果:
- 介绍了QED-CC理论的新型图形符号.
- 该符号用于导出特定截断方案 (QED-CCSD-1-SD,QED-CCSD-12-SD) 的QED-CC和QED-EOM-CC方程.
- 为计算分子性质提供了必不可少的图表.
结论:
- 开发的图形符号为QED-CC理论提供了一个系统的方法.
- 这种形式主义适用于对极子系统和分子性质的研究.
- 这项工作为QED影响化学的先进计算研究提供了基础.
相关概念视频
02:40MO Theory and Covalent Bonding
10.3K
The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
10.3K
01:08Hückel's Rule Diagram of π MOs: Frost Circle
4.4K
The Frost circle or the inscribed polygon method is a graphical method for determining the relative energies of π molecular orbitals (MOs) for planar, fully conjugated, and monocyclic compounds. This method was first described by A. A. Frost and Boris Musulin in 1953.
A Frost circle is constructed by drawing a polygon whose number of edges is equal to the number of carbons of the given cyclic system, with one of the vertices pointing down. Then, a circle is drawn enclosing the polygon so...
A Frost circle is constructed by drawing a polygon whose number of edges is equal to the number of carbons of the given cyclic system, with one of the vertices pointing down. Then, a circle is drawn enclosing the polygon so...
4.4K
01:29Potential Due to a Polarized Object
367
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
367
02:35Molecular Orbital Theory I
31.8K
Overview of Molecular Orbital Theory
31.8K
02:58Crystal Field Theory - Octahedral Complexes
26.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.2K
03:51Molecular Orbital Theory II
19.0K
Molecular Orbital Energy Diagrams
19.0K