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相关概念视频

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: 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 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...
919
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

939
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...
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The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Atomic Nuclei: Nuclear Spin01:08

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
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Updated: Jun 30, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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旋转轨道Jahn-Teller双极化的人.

Lorenzo Celiberti1,2, Dario Fiore Mosca1,3,4, Giuseppe Allodi5

  • 1Faculty of Physics and Center for Computational Materials Science, University of Vienna, 1090, Vienna, Austria.

Nature communications
|March 19, 2024
PubMed
概括
此摘要是机器生成的。

这项研究揭示了在化氧化物中的自旋轨道双极子,在这种情况下,极子和自旋轨道合相互作用. 这种纠在兴奋剂中保留了Mott差距,影响了电荷传输和旋转轨道电子学.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 材料科学 材料科学
  • 量子力学就是量子力学.

背景情况:

  • 极子是由电子-声子相互作用和电子定位产生的,在3D过渡金属氧化物中很常见.
  • 在重原子 (5d过渡金属氧化物) 中,旋转轨道合具有显著的意义,具有脱离位置的电子.
  • 这些现象通常被认为是不同的,相互排斥的负载运输和旋转轨道电子学.

研究的目的:

  • 为了研究极子和自旋轨道合在电子杂的氧化物之间的相互作用.
  • 为了证明Ba2Na1−xCaxOsO6.6中自旋轨道双极子的形成.
  • 了解这些纠的相互作用对材料特性和电子相位过渡的影响.

主要方法:

  • 结合了ab initio计算来建模电子结构和相互作用.
  • 实验性磁性测量以表征材料属性.
  • 对5d电子配置和旋转轨道状态的电子兴奋作用的分析.

主要成果:

  • 证明了极子和自旋轨道合的纠,在Ba2Na1−xCaxOsO6.6中形成自旋轨道双极子.
  • 由于极子捕获,观察到Os 5d1 J_eff=3/2水平转化为5d2 J_eff=2双相双色管道.
  • 展示了不同J-有效状态在单一阶段的共存,以及在整个兴奋剂范围内的Mott差距的保存.

结论:

  • 这项研究揭示了一个新的量子效应:自旋轨道双极子,由极子和自旋轨道合的纠引起.
  • 极子电荷捕获和Jahn-Teller活动是驱动研究的氧化物中这种现象的关键机制.
  • 旋转轨道双极子的形成阻止了金属化,即使在高注水平下也保持了Mott差距.