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

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

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

Spin–Spin Coupling: One-Bond Coupling

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

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

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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 involved orbitals. The...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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...
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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多模式空洞 QED 是旋转玻璃

Brendan P Marsh1,2, David Atri Schuller1,2, Yunpeng Ji1,2,3

  • 1Stanford University, Department of Applied Physics, Stanford, California 94305, USA.

Physical review letters
|October 31, 2025
PubMed
概括
此摘要是机器生成的。

我们使用超冷原子和空腔量子电动力学 (QED) 创建了一种新型驱动散射Ising旋转玻璃. 该系统表现出平衡旋转玻璃特性,如复制对称性破坏 (RSB),可用于内存应用.

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科学领域:

  • 量子仿真是一种量子仿真.
  • 凝聚物质物理学 凝聚物质物理学
  • 洞穴量子电动力学 (QED) 是一个

背景情况:

  • 旋转玻璃是复杂的磁性材料,具有无序的相互作用.
  • 了解它们的特性,特别是在驱动散流系统中,至关重要.
  • 洞穴QED为模拟这些系统提供了一个新的平台.

研究的目的:

  • 为了实现一个驱动散流的Ising旋转玻璃,使用一个空腔中的超冷原子.
  • 为了研究在一个不平衡系统中平衡旋转玻璃属性的出现.
  • 探索协会记忆和衰老研究中的潜在应用.

主要方法:

  • 利用被困在光学子中的超冷原子作为有效的旋转.
  • 采用 "4/7" 多模腔 QED 几何来实现全对全的 Ising 交互.
  • 通过挫败的横向场Ising过渡驱动系统.
  • 通过空腔辐射对直至n=25的自旋网络进行全息成像.

主要成果:

  • 证明旋转玻璃状态取决于过渡交叉速率.
  • 观察平衡旋转镜的特征现象,包括复制对称性破坏 (RSB) 和超矩度.
  • 测量了帕里西函数q(x),爱德华兹-安德森重叠q_{EA},以及高达n=16的系统大小的超公度K相关器,证实了RSB下的深度排序.

结论:

  • 在空腔QED中实现的驱动散热的Ising旋转玻璃表现出平衡旋转玻璃的特征.
  • 系统的行为,包括对驱动速度的依赖,为不平衡相位过渡提供了洞察力.
  • 这个平台可以对衰老和复苏进行微观研究,并显示了关联记忆应用的潜力.