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相关概念视频

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

719
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
719
Applications Of NMR In Biology01:25

Applications Of NMR In Biology

3.7K
Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
3.7K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
681
Paramagnetism01:30

Paramagnetism

2.5K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.5K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

240
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...
240
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

2.6K
Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
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相关实验视频

Updated: Jul 15, 2025

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

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通过固态核磁共振 (NMR) 来确定和精炼参磁材料的结构.

Jonas Koppe1, Andrew J Pell1

  • 1Centre de RMN à Très Hauts Champs de Lyon (UMR 5082 - CNRS, ENS Lyon, UCB Lyon 1), Université de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France.

ACS physical chemistry Au
|October 2, 2023
PubMed
概括

固态核磁共振光谱 (ssNMR) 现在可以为偏磁材料提供详细的结构信息. 先进的技术克服了信号挑战,使全面的结构特征成为可能.

科学领域:

  • 固态化学 固态化学
  • 材料科学是一种材料科学.
  • 频谱学是一种光谱学.

背景情况:

  • 由于电子核相互作用,固体中的偏磁性使使用固态核磁共振光谱 (ssNMR) 的结构分析复杂化.
  • 这些相互作用导致信号衰减和广泛的共振,从历史上对高分辨率ssNMR构成挑战.
  • 理论模型和实验协议的近期进展显著提高了对偏磁系统的ssNMR能力.

研究的目的:

  • 审查和讨论具有偏磁材料特征的ssNMR参数.
  • 突出这些参数的解释,以在各种长度尺度上进行结构性确定.
  • 评估ssNMR在表征类磁性材料结构中的当前潜力和局限性.

主要方法:

  • 开发用于计算偏磁变频的理论模型.
  • 实施复杂的高分辨率ssNMR的实验协议.
  • 分析ssNMR参数,编码从局部绑定到远程订单的结构信息.

主要成果:

  • 最先进的数值和实验技术为偏磁固体提供了高质量的ssNMR数据.
  • ssNMR参数提供了对晶体形态,中长距离秩序以及局部原子环境的洞察.
  • ssNMR数据有效地补充了X射线衍射等技术的实验结果.

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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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Last Updated: Jul 15, 2025

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins

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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

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结论:

  • ssNMR越来越能够确定和完善偏磁材料的结构.
  • 进一步的进步可以增强ssNMR在综合结构表征中的作用,与联合电子显微镜,衍射和光谱相竞争.
  • 该研究表明ssNMR在材料结构阐明方面的重大进展和未来潜力.