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相关概念视频

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.9K
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 one, the...
1.9K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.0K
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...
3.0K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.4K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.4K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.6K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.6K

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相关实验视频

Updated: Jan 18, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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可编程的全光学旋转模拟器与人工测量场.

Simon Mahler1, Eran Bernstein1, Sagie Gadasi1

  • 1Weizmann Institute of Science, Department of Physics of Complex Systems, Rehovot 761001, Israel.

Physical review letters
|September 10, 2025
PubMed
概括
此摘要是机器生成的。

研究人员在激光阵列中演示了赫米蒂安合,从而能够精确控制相锁和奇拉性. 这项工作为光学旋转模拟器铺平了道路.

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科学领域:

  • 量子光学就是一个量子光学.
  • 激光物理学的激光物理学
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 激光合对于高功率激光器和研究复杂系统至关重要.
  • 控制合参数是操纵激光阵列行为的关键.

研究的目的:

  • 为了研究各种激光阵列几何形状的赫米蒂安合.
  • 为了证明精确控制激光合振幅和相位.
  • 为了生成人工测量场,并探索拓现象.

主要方法:

  • 在方形,三角形和环形激光阵列中实现了赫米蒂安合.
  • 在正方形阵列中实现了高精度 (2π/120半径) 的任意激光合.
  • 在三角阵列中控制激光奇拉性,99%的纯度.
  • 在一个环阵列中引入了人工尺度场,以研究拓相位过渡.

主要成果:

  • 在100激光方形阵列中达到任意的相锁状态.
  • 在130激光三角阵列中证明了受控的奇拉性.
  • 在八个激光环阵列中观察到拓相锁状态之间的离散量化过渡.

结论:

  • 赫米蒂安合提供了对激光阵列的精确控制.
  • 这种技术可以生成人工测距场,并探索拓状态.
  • 这些发现支持用于可编程合系统的全光学旋转模拟器的开发.