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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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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...
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Electronic Structure of Atoms02:28

Electronic Structure of Atoms

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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Reduced Mass Coordinates: Isolated Two-body Problem01:12

Reduced Mass Coordinates: Isolated Two-body Problem

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In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
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Stability of Equilibrium Configuration01:23

Stability of Equilibrium Configuration

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Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
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Equilibrium Conditions for a Particle01:23

Equilibrium Conditions for a Particle

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When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
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Updated: May 13, 2025

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

Published on: April 8, 2020

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增量全配置交互的多体基础集改进方法.

Jeffrey Hatch1, Alan E Rask1, Duy-Khoi Dang1

  • 1Department of Chemistry, University of Michigan, 930 N. University Avenue, Ann Arbor, Michigan 48109, United States.

The journal of physical chemistry. A
|April 14, 2025
PubMed
概括

渐进式全配置交互 (iFCI) 现在通过新的多体基础集合改善 (MBBSA) 方法扩展到更大的系统. MBBSA显著降低了计算成本,同时保持了电子结构计算的化学精度.

科学领域:

  • 量子化学 是一个量子化学.
  • 计算化学计算化学
  • 电子结构理论 电子结构理论

背景情况:

  • 全配置交互 (FCI) 提供了精确的解决方案,但对于大多数系统来说,它在计算上是难以处理的.
  • 增量完全配置交互 (iFCI) 提供了一个多项式成本方法,以系统地接近FCI极限.
  • 将iFCI应用于更大的原子轨道基础集仍然具有计算要求.

研究的目的:

  • 介绍了多体基础集改善 (MBBSA) 方法.
  • 允许iFCI应用于更大的原子轨道基础集.
  • 降低高精度电子结构计算的计算成本.

主要方法:

  • 介绍了多体基础集改善 (MBBSA) 方法.
  • MBBSA使用了一系列具有成本效益的iFCI计算.
  • 它接近于从昂贵,高精度的iFCI计算中获得的相关性能量.

主要成果:

  • 在化学准确度范围内,MBBSA实现了总和相对能量的近似值.
  • 与标准的iFCI相比,MBBSA将计算成本降低了6092%.
  • 较大的分子系统从成本降低中受益最为显著.

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Last Updated: May 13, 2025

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

  • MBBSA增强了iFCI对更大的基础集的适用性.
  • 该方法在研究复杂化学反应方面具有实际实用性.
  • MBBSA有助于对高度相关的系统进行精确的电子结构研究.