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相关概念视频

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

959
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...
959
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.0K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.0K

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相关实验视频

Updated: Jun 4, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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合控制的光子拓环阵列.

Chang Chang1,2,3, Yuhan Sun1,2,3, Ting Li1

  • 1School of Information Science and Technology, ShanghaiTech University, Shanghai 201210, China.

ACS photonics
|December 23, 2024
PubMed
概括
此摘要是机器生成的。

研究人员使用合共振器光学波导 (CROWs) 演示了一个可调节的光子拓绝缘器. 这种强大的系统引导光线沿着可控制的边界,为光学设备的缺陷提供解决方案.

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相关实验视频

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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科学领域:

  • 光子学 是一个光子学.
  • 凝聚物质物理学 凝聚物质物理学
  • 光学工程是指光学工程.

背景情况:

  • 光子拓绝缘器通过利用边界状态提供强大的光传播,减轻结构缺陷的问题.
  • 合共振器光波导 (CROW) 是实现光子拓绝缘体的有效平台,因为它们具有不同的拓相和带结构.

研究的目的:

  • 设计和实验验证一种能够动态改变其拓相的CROW数组.
  • 通过操纵CROW数组内的拓和微不足道区域之间的界限来证明对光传播的控制.

主要方法:

  • 连接共振器光学波导 (CROW) 阵列的制造.
  • 通过调整共振器之间的合强度来验证可调节的拓相变的实验验证.
  • 在拓和微不足道的绝缘体区域之间沿着工程界限引导光的演示.

主要成果:

  • CROW阵列成功展示了可调节的拓相.
  • 光线沿着拓和微不足道区域之间的边界引导,证明了缺陷免疫传播.
  • 通过改变拓绝缘器区域的形状来控制光学路径.

结论:

  • 开发的基于CROW的光子拓绝缘器为控制光传播提供了一个强大的方法.
  • 这种可调节系统显示了在光学开关,动态光转向,传感和计算方面的实际应用潜力.