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相关概念视频

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

198
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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,...
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Negative Regulator Molecules01:23

Negative Regulator Molecules

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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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Formal Charges02:42

Formal Charges

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In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
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Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
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相关实验视频

Updated: Jun 25, 2025

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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使用非局部交换相关函数服负离子共振.

Abhisek Ghosal1, Pulkit Joshi1, Vamsee K Voora1

  • 1Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India.

The journal of physical chemistry letters
|May 30, 2024
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概括
此摘要是机器生成的。

这项研究为密度函数理论引入了一个新的非局部交换相关性潜力,改善了负离子共振的表征. 改进的方法准确地描述了共振位置和宽度,提供了一个实际的解决方案.

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科学领域:

  • 量子化学 是一个量子化学.
  • 计算物理 计算物理
  • 材料科学 材料科学 材料科学

背景情况:

  • 对于密度函数方法来说,鉴别负离子共振是很困难的,因为它们的性质不结合.
  • 现有的方法很难准确地描述这些共振的特性.

研究的目的:

  • 开发一种改进的密度功能方法,用于准确地描述负离子共振.
  • 克服当前方法在描述无约束电子状态时的局限性.

主要方法:

  • 提出了一个单粒子非局部交换相关性 (xc) 潜力,结合了精确交换 (EXX) 和随机相近似 (RPA) 相关性.
  • 利用复杂的吸收局部潜力来扰乱真实的赫米蒂亚非局部xc潜力进行共振识别.
  • 采用低缩放算法来有效计算RPA潜力.

主要成果:

  • 非局部EXX+RPA潜力显著改善了负离子共振位置和宽度的描述.
  • 与不包括动态极化或仅使用EXX的潜力相比,已证明性能优越.
  • 通过简化计算展示了该方法的实用性.

结论:

  • 开发的非局部EXX+RPA潜力为密度函数理论中的负离子共振的表征提供了实用和准确的解决方案.
  • 理论框架支持将真实的赫米特非局部xc潜能与复杂的局部潜能结合起来.