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相关概念视频

Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Valence Bond Theory and Hybridized Orbitals02:38

Valence Bond Theory and Hybridized Orbitals

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According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
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MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

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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...
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Introduction to Chemical Bonds01:01

Introduction to Chemical Bonds

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Chemical Bonds
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...
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Chemical Bonds02:40

Chemical Bonds

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Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
An ionic bond is formed due to electrostatic attraction between cations and anions. Often, the ions are formed by the transfer of electrons...
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VSEPR Theory and the Basic Shapes02:52

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相关实验视频

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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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向可转移的经验价值债券:使经典力场变得有反应性.

Alice E A Allen1,2, Gábor Csányi3

  • 1Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

The Journal of chemical physics
|March 25, 2024
PubMed
概括

神经网络现在可以使用反应SMILES字符串预测经验价值键 (EVB) 模拟的参数. 这消除了对量子力学计算的需求,使得用经典力场进行反应性原子模拟成为可能.

科学领域:

  • 计算化学是一种计算化学.
  • 材料科学是一种材料科学.
  • 化学物理 化学物理

背景情况:

  • 经典力场对于原子学模拟是必不可少的,但对于模拟反应过程却很难.
  • 经验价值键 (EVB) 技术将经典力场扩展到反应模拟中.
  • EVB需要广泛的参数化,通常涉及计算上昂贵的量子力学计算或每个反应的实验数据.

研究的目的:

  • 开发一种使用机器学习预测EVB参数的新方法.
  • 为了消除在EVB参数化中需要量子力学计算的需要.
  • 为了方便使用经典力场进行反应原子模拟.

主要方法:

  • 一个神经网络模型被训练来预测EVB参数.
  • 该模型使用SMILES字符串,一种化学符号,来描述化学反应.
  • 预测的参数被整合到经典的力场模拟中.

主要成果:

  • 神经网络成功地从反应SMILES字符串中预测了EVB参数.
  • 这种方法避免了在参数化过程中进行量子力学计算的必要性.
  • 该方法证明了使用机器学习用于EVB参数预测的可行性.

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结论:

  • 已经建立了一种新程序,使反应性原子模拟成为可能.
  • 研究人员现在可以利用现有的经典力场进行反应模拟,而无需额外的量子计算.
  • 这项工作为计算化学中更容易获得和更有效的反应模拟铺平了道路.