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相关概念视频

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

248
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...
248
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.5K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.5K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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...
1.1K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.1K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.1K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.1K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.1K
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

737
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...
737

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相关实验视频

Updated: Jul 26, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Gradient Echo Quantum Memory in Warm Atomic Vapor

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固态NMR双量子双极再合增强通过额外的相位调制.

Hang Xiao1,2, Zhengfeng Zhang1,3, Huimin Kang1

  • 1National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China.

Chemphyschem : a European journal of chemical physics and physical chemistry
|June 13, 2023
PubMed
概括

额外相调制 (APM) 提高了同核双量子 (DQ) 复合的固态NMR效率. 这种方法可以提高理论效率高达30%,并且可以通过优化实现近乎完美的重新合.

关键词:
增强过程的增强过程增强过程增强过程增强过程增强过程双量子同核重新合的双量子同核重新合阶段调制,转移效率效率等.固态NMR是一种固态NMR.

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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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相关实验视频

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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科学领域:

  • 固态核磁共振 (NMR) 光谱学
  • 量子信息处理和控制

背景情况:

  • 同核双量子 (DQ) 复合对于固态NMR中的结构分析至关重要.
  • 现有的再合方法在理论效率和在不同再合方案中的适用性方面存在局限.

研究的目的:

  • 引入和评估额外相调制 (APM) 作为一种新的技术,以提高同核DQ复合效率.
  • 证明APM在各种重新合类型的多功能性,包括γ编码和非γ编码的方案.

主要方法:

  • APM涉及将一个额外的阶段列表应用于DQ重新合序列.
  • 研究了基于Sine的阶段列表,以及基因算法 (GA) 优化的APM,以获得adiabatic增强.
  • 该方法在模型系统 (SPR-51,BaBa,SPR-31) 上进行了测试,并通过使用2,3-13C标记的氨酸进行实验验证.

主要成果:

  • 基于Sine的APM将理论效率提高了15-30%,达到0.68的非γ编码复合和0.84的γ编码复合.
  • 在 GA 优化的 APM 中,在较长的复合时间下,实现了接近单元 (∼1.0) 的效率.
  • 模拟表明,APM通过激活粉样中的更大一部分晶体来提高效率.

结论:

  • 在固态NMR中,APM代表了提高同核DQ复合效率的重大进步.
  • 该方法在不同重新合类型中的有效性以及在实验环境中的验证凸显了其潜力.
  • 在NMR光谱学中,APM为开发更强大,更有效的再合技术提供了一个有希望的新方向.