Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Induced Electric Dipoles01:28

Induced Electric Dipoles

4.2K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.2K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

934
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
934
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

397
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
397
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

648
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.
648
Diamagnetism01:26

Diamagnetism

2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.4K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Water-Mediated Phosphoryl Wires Stabilize Pathological Tau Fibrils.

Angewandte Chemie (International ed. in English)·2026
Same author

Correction to "Detection of Mutation-Induced Conformational Changes in an Intrinsically Disordered Protein by Double Quantum Coherence Electron Spin Resonance Methodology".

Journal of the American Chemical Society·2026
Same author

Exchange coupling-assisted <sup>13</sup>C dynamic nuclear polarization in microdiamonds at 14 T.

Physical chemistry chemical physics : PCCP·2026
Same author

Detection of Mutation-Induced Conformational Changes in an Intrinsically Disordered Protein by Double Quantum Coherence Electron Spin Resonance Methodology.

Journal of the American Chemical Society·2026
Same author

DEER of Singly Labelled Proteins to Evaluate Supramolecular Packing of Amyloid Fibrils.

bioRxiv : the preprint server for biology·2025
Same author

Correction to "Mutations in Tau Protein Promote Aggregation by Favoring Extended Conformations".

JACS Au·2025
Same journal

Revisiting the C60ISO and iso-C60 Data Sets of Relative Energies for C<sub>60</sub> Isomers.

The journal of physical chemistry letters·2026
Same journal

Mechanisms of White-Light Emission and Pressure-Modulated Dual Emission in Weak Donor-Acceptor Systems: A Theoretical Perspective.

The journal of physical chemistry letters·2026
Same journal

Thermally Activated Fluxionality Accelerates Nonradiative Decay in Titania Nanoclusters.

The journal of physical chemistry letters·2026
Same journal

The Mixed-Valence Missing Link: Direct Observation of Borderline Electron Transfer Dynamics.

The journal of physical chemistry letters·2026
Same journal

Brassinolide and β-Sitosterol Interleaflet Diffusion in an Asymmetric Plant Model Membrane.

The journal of physical chemistry letters·2026
Same journal

Self-Healing Dye-Conjugated Nanobody Probe for Super-Resolution Imaging with Enhanced Photon Budget.

The journal of physical chemistry letters·2026
查看所有相关文章

相关实验视频

Updated: Jun 26, 2025

Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
11:43

Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging

Published on: December 30, 2016

10.5K

双极秩序诱导的电子旋转超极化

Asif Equbal1,2, Chandrasekhar Ramanathan3, Songi Han4,5

  • 1Department of Chemistry, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates.

The journal of physical chemistry letters
|May 13, 2024
PubMed
概括
此摘要是机器生成的。

对量子传感和动态核极化而言,对合电子旋转的特征至关重要. 这项研究揭示了在电子双共振 (ELDOR) 实验中选择性微波和产生电子自旋超极化,通过在AX类自旋系统中创建二极性秩序.

更多相关视频

Hyperpolarized Xenon for NMR and MRI Applications
16:20

Hyperpolarized Xenon for NMR and MRI Applications

Published on: September 6, 2012

19.5K
Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
11:57

Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate

Published on: September 13, 2019

6.6K

相关实验视频

Last Updated: Jun 26, 2025

Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
11:43

Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging

Published on: December 30, 2016

10.5K
Hyperpolarized Xenon for NMR and MRI Applications
16:20

Hyperpolarized Xenon for NMR and MRI Applications

Published on: September 6, 2012

19.5K
Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
11:57

Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate

Published on: September 13, 2019

6.6K

科学领域:

  • 磁共振是一种磁共振.
  • 量子信息科学 量子信息科学
  • 化学物理 化学物理

背景情况:

  • 合电子自旋系统对于动态核极化 (DNP),增强核磁共振 (NMR) 和量子信息科学 (QIS) 是至关重要的.
  • 描述电子自旋合网络具有挑战性,特别是在高磁场下.
  • 高度的三基表现出DNP增强特征,表明电子自旋集群.

研究的目的:

  • 通过使用探ELectron DOuble Resonance (ELDOR) 来研究合电子旋转系统中的电子旋转超极化机制.
  • 证明选择性微波和可以产生和表征电子自旋超极化.
  • 探索纵向二极体顺序在短暂电子旋转超极化中的作用.

主要方法:

  • 使用探头ELectron双共振 (ELDOR) 实验进行选择性微波和.
  • 分析H NMR增强配置,以识别电子自旋集群.
  • 研究脉冲长度和间脉冲延迟对二极序列生成和读出的影响.

主要成果:

  • 在特基系统中,在选择性微波和时观察到电子自旋超极化.
  • 证明产生不平衡的纵向二极体顺序是电子自旋超极化的原因.
  • 表明合的电子旋转必须形成一个类似于AX的系统,用于选择性微波辐射以诱导超极化.
  • 通过调整ELDOR实验参数来量化二极点顺序的变化.

结论:

  • 具有选择性和的探 ELDOR 是在 AX 型旋转系统中表征合电子旋转的有效方法.
  • 这种技术是DNP和量子传感应用的基础.
  • 了解和控制双极秩序是产生电子自旋超极化的关键.