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相关概念视频

Van der Waals Interactions01:24

Van der Waals Interactions

63.4K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
63.4K
Intermolecular Forces03:13

Intermolecular Forces

57.6K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
57.6K
Boundary Conditions for Current Density01:25

Boundary Conditions for Current Density

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Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

46.4K
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...
46.4K
Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

1.7K
The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an...
1.7K
Density00:56

Density

14.6K
Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
14.6K

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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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无分散的非混合密度函数的功能.

Atta Ur Rehman1, Krzysztof Szalewicz1

  • 1Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, United States.

Journal of chemical theory and computation
|January 17, 2025
PubMed
概括
此摘要是机器生成的。

一种新的分散校正密度函数理论 (DFT+D) 方法为计算相互作用能量提供了更高的准确性. 这种先进的计算化学方法比现有方法提供了更可靠的结果.

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科学领域:

  • 计算化学计算化学
  • 量子化学 是一个量子化学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 密度函数理论 (DFT) 是一种强大的量子力学建模方法.
  • 准确地描述非共价相互作用,特别是范德瓦尔斯力,在DFT中仍然是一个挑战.
  • 现有的分散校正DFT (DFT+D) 方法在准确性和计算成本方面存在局限性.

研究的目的:

  • 开发一种新,准确和高效的分散校正DFT (DFT+D) 方法.
  • 为了优化一种新的非混合型通用梯度近似 (GGA) 函数,使用分散元件.
  • 评估新方法的性能与既有DFT+D方法相比.

主要方法:

  • 开发一种新的分散校正的DFT (DFT+D) 方法.
  • 包括一个非混合无分散的GGA函数和一个文献参数化的分散函数.
  • 使用589个基准相互作用能量的训练集优化9个可调节的参数.

主要成果:

  • 新的DFT+D方法实现了0.33 kcal/mol的相互作用能量的平均无标记误差.
  • 在准确性方面表现优于其他基于GGA的DFT+D方法.
  • 与计算上更昂贵的meta-GGA和混合DFT+D函数相比,其表现可比或优越.
  • 分散能成分准确地反映了跨分子间分离的真实散散能.

结论:

  • 开发的DFT+D方法代表了计算机化学在描述非共价相互作用方面取得的重大进展.
  • 提供高精度和效率的平衡,使其适合各种应用.
  • 与现有的 DFT+D 方法相比,提供了更准确的分散能量的表示.