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相关概念视频

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.7K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.7K
MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

10.6K
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...
10.6K
Molecular Orbital Theory I02:35

Molecular Orbital Theory I

32.2K
Overview of Molecular Orbital Theory
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Molecular Orbital Theory II03:51

Molecular Orbital Theory II

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Molecular Orbital Energy Diagrams
19.3K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.8K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.8K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

1.4K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
1.4K

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相关实验视频

Updated: Jul 17, 2025

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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自然光学活动从密度-功能性扰动理论.

Asier Zabalo1, Massimiliano Stengel1,2

  • 1Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain.

Physical review letters
|September 8, 2023
PubMed
概括

本研究介绍了一种有效的计算方法来计算自然光学活动. 新的方法准确地预测了奇拉分子和晶体的光学特性,与实验数据保持一致.

科学领域:

  • 计算化学的计算化学
  • 量子力学就是量子力学.
  • 频谱学是一种光谱学.

背景情况:

  • 自然光学活动是奇拉分子和晶体的关键性质.
  • 精确的理论预测光学活动是计算上具有挑战性的.
  • 现有的方法往往涉及复杂的总结和近似.

研究的目的:

  • 开发一个准确和计算效率高的第一原则方法来计算自然光学活动.
  • 将关键的自相一致的领域术语纳入理论框架.
  • 提供一种可靠的方法来预测奇拉系统的光学特性.

主要方法:

  • 使用长波密度功能性扰动理论.
  • 直接将自相一致的领域术语集成到形式主义中.
  • 使用对均场扰动的响应函数表示结果,避免对空状态进行总和.

主要成果:

  • 该方法精确计算了自然光学活动张量.
  • 发现与三角形Se,α-HgS,α-SiO2和C4H4O2.2.的实验数据有很好的一致性.
  • 与以前的方法相比,这种方法在计算上被证明是有效的.

结论:

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  • 提出的第一原则方法提供了一种准确而有效的方法来计算自然光学活动.
  • 这种方法通过避免对空状态进行总和来简化计算.
  • 它作为一种有价值的工具,用于研究性材料和分子.