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相关概念视频

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.0K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

658
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
658
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

988
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
988
Atomic Radii and Effective Nuclear Charge03:08

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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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...
710
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

877
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
877

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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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核量子效应变得可访问:局部密度适合多元组件方法.

Lukas Hasecke1, Ricardo A Mata1

  • 1Institute of Physical Chemistry, University of Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany.

Journal of chemical theory and computation
|November 3, 2023
PubMed
概括
此摘要是机器生成的。

准确模拟核量子效应 (NQE) 对于理解轻核至关重要. 我们开发了一种新的计算方法,LDF-NEO-HF,可以有效地将NQE纳入大型系统,使复杂的模拟可访问.

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科学领域:

  • 计算化学的计算化学
  • 量子力学就是量子力学.
  • 材料科学 材料科学 材料科学
  • 生物物理学的生物物理.

背景情况:

  • 核量子效应 (NQE) 对于准确描述具有轻核,特别是核的系统至关重要.
  • NQE的影响涵盖化学,生物学,物理和材料科学,但计算可访问的方法仍然有限.
  • 目前的电子结构理论方法是常规的,但缺乏有效的方法来纳入NQEs.

研究的目的:

  • 开发一种计算效率高且易于使用的方法来模拟核量子效应 (NQE).
  • 将核电子轨道哈特里-福克 (NEO-HF) 方法与局部和密度合适近似方法 (LDF) 整合起来.
  • 能够将NQE纳入各种科学学科相关的大规模系统.

主要方法:

  • 介绍了核电子轨道哈特里-福克 (LDF-NEO-HF) 方法的局部和密度拟合近似值.
  • 开发了一种低序缩放计算方法来模拟NQEs.
  • 将LDF-NEO-HF方法应用于化学,生物和材料科学用例.

主要成果:

  • 实现了包括NQE的低序缩放方法,显著降低了计算成本.
  • 启用NQE模拟大系统在一天内,小系统在几分钟内.
  • 在各种应用中证明了LDF-NEO-HF方法的定性准确性和稳定性.

结论:

  • LDF-NEO-HF方法提供了一种高效且易于使用的方法,用于将NQE纳入量子化学计算.
  • 这种方法促进了对NQE发挥关键作用的系统的研究,推动了多个科学领域的发展.
  • 开发的方法代表了复杂的化学,生物和材料系统的计算建模的重大进步.