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相关概念视频

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Energy Bands in Solids01:01

Energy Bands in Solids

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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
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Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation04:01

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

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Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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First Law: Particles in One-dimensional Equilibrium01:10

First Law: Particles in One-dimensional Equilibrium

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Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
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First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

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Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
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相关实验视频

Updated: Jan 14, 2026

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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对于固体Ab Initio的规范化扰动理论

Meng-Fu Chen1, Jinghong Zhang1, Hieu Q Dinh1

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.

The journal of physical chemistry letters
|October 24, 2025
PubMed
概括
此摘要是机器生成的。

我们为固态模拟开发了规则化的扰动理论. 布里卢恩-维格纳方法 (BW-s2) 对金属和半导体具有很高的准确性,为合集群方法提供了具有成本效益的替代方案.

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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相关实验视频

Last Updated: Jan 14, 2026

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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科学领域:

  • 计算物理学的计算物理.
  • 量子化学是一种量子化学.
  • 材料科学是一种材料科学.

背景情况:

  • 第二阶梅勒-普莱塞特扰动理论 (MP2) 在模拟固体方面面临挑战,包括分歧和过度相关性问题.
  • 这些限制在金属,窄间隙和分散稳定系统中尤为明显.

研究的目的:

  • 开发和评估新的规范化二阶扰动理论,用于精确的*ab initio*固体模拟.
  • 评估这些方法在各种材料类别的性能,包括金属,半导体,分子晶体和稀有气体固体.

主要方法:

  • 开发和应用三种规范化的二次扰动理论: κ-MP2, σ-MP2 和大小一致的布里洛因-维格纳方法 (BW-s2).
  • 对这些方法的系统评估,用于计算各种固体类型的凝聚能,格子常量和散装模块.

主要成果:

  • 布里卢恩-维格纳方法 (BW-s2) 证明了对金属,半导体和分子晶体中的凝聚能,格子常数和散装模块的高精度.
  • 在降低计算成本的情况下,BW-s2的性能与单个和双重 (CCSD) 的合集群竞争或超越.
  • 在稀有气体固体中,在标准MP2底层结合的情况下, κ-MP2显示最小的降解,而BW-s2遇到了困难.

结论:

  • 规则化的扰动理论为高效准确的固态模拟提供了一个有前途的途径,解决了标准MP2的局限性.
  • BW-s2,特别是具有特定参数化 (α = 2) 的方法,成为一个非常有前途的方法,可能会超过当代随机相近似和合集群理论.
  • 建议对更广泛的系统进行进一步验证,以充分确定这些先进的理论方法的功能.