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相关概念视频

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

365
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,...
365
Induced Electric Dipoles01:28

Induced Electric Dipoles

4.2K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.2K
Calculations of Electric Potential II01:27

Calculations of Electric Potential II

1.6K
An electric dipole is a system of two equal but opposite charges, separated by a fixed distance. This system is used to model many real-world systems, including atomic and molecular interactions. One of these systems is the water molecule, but only under certain circumstances. These circumstances are met inside a microwave oven, where electric fields with alternating directions make the water molecules change orientation. This vibration is equivalent to heat at the molecular level.
Consider a...
1.6K
Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

12.6K
The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
12.6K
Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

28.6K
Bond Polarity
28.6K
Electric Dipoles and Dipole Moment01:30

Electric Dipoles and Dipole Moment

5.0K
Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
5.0K

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Solvent effects on triplet yields in BODIPY-based photosensitizers.

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相关实验视频

Updated: Jun 4, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

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有效的极化QM/MM 使用直接反应场哈密尔顿与静电电位配备的多极运营商.

Thomas P Fay1, Nicolas Ferré1, Miquel Huix-Rotllant1

  • 1Aix Marseille Univ, CNRS, ICR, 13397 Marseille, France.

Journal of chemical theory and computation
|December 20, 2024
PubMed
概括

这项研究通过将直接反应场 (DRF) 方法与静电电位配套 (ESPF) 多极运算器相结合,增强了分子相互作用计算. 这提高了复杂系统中电子激发能量的效率和精度.

科学领域:

  • 计算化学是一种计算化学.
  • 量子力学就是量子力学.
  • 分子力学分子力学

背景情况:

  • 电子极化和分散显著影响分子相互作用和激发能.
  • 复杂的环境会放大这些效应,尤其是在电荷重组过程中.
  • 量子力学/分子力学 (QM/MM) 模型对于研究这些系统至关重要.

研究的目的:

  • 提高分子相互作用的QM/MM模型的效率和准确性.
  • 整合直接反应场 (DRF) 方法与电静电位配备 (ESPF) 多极运营商.
  • 为了准确预测电子激发能量和solvatochromic变化.

主要方法:

  • 结合直接反应场 (DRF) 方法与电静电位装配 (ESPF) 多极操作员描述.
  • 将DRF与波动电荷和以原子为中心的双极极化模型集成到环境中.
  • 应用ESPF-DRF方法来计算气体到水溶液的溶解对acrolein的色变化.

主要成果:

  • ESPF-DRF方法显著提高了计算效率,特别是在大型分子力学 (MM) 系统中.
  • 该方法有效地消除了在典型计算中对MM系统大小的依赖.
  • 在基态和兴奋电子状态中,分子相互作用的准确描述得到了实现.

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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相关实验视频

Last Updated: Jun 4, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

Published on: July 19, 2019

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

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结论:

  • 增强的ESPF-DRF方法为QM/MM研究提供了一个计算效率高,准确的框架.
  • 它准确地预测了缩相中的分子相互作用和光谱转移.
  • 这种方法对于理解复杂分子环境中的电子激发是有价值的.