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関連する概念動画

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

980
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...
980
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
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...
1.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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...
1.1K
Induced Electric Dipoles01:28

Induced Electric Dipoles

4.3K
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...
4.3K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.5K
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...
1.5K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K

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関連する実験動画

Updated: Aug 12, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

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極性分子による調節可能な移動スピンダイナミクス

Jun-Ru Li1, Kyle Matsuda2, Calder Miller2

  • 1JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, CO, USA. junru.li@colorado.edu.

Nature
|February 1, 2023
PubMed
まとめ

カリウム-ルビジウム分子を用いて制御可能な量子スピンシステムを開発しました このプラットフォームは,調節可能な二極相互作用を通じて,多体スピンダイナミクスとスピン運動物理学の探索を可能にします.

さらに関連する動画

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

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関連する実験動画

Last Updated: Aug 12, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

10.0K
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

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科学分野:

  • 量子物理学
  • 原子,分子,光学物理学
  • 凝縮物質物理学

背景:

  • 強く相互作用するスピンは 磁気と量子情報処理の基本です
  • スピンの超流動性のような 奇妙な現象を現します
  • 制御可能な相互作用するスピンシステムは,複雑なスピンダイナミクスを研究するために不可欠です.

研究 の 目的:

  • 移動スピンダイナミクスを研究するための高度に制御可能なプラットフォームを実証する.
  • 量子スピン制御のための カリウム-ルビジウム分子の 調節可能な二極相互作用を活用する

主な方法:

  • カリウム-ルビジウム分子の分子回転レベルにスピン-1/2システムをコードする.
  • 二極の相互作用を 強化するために 分子を二次元平面に閉じ込めます
  • 電気場と分子状態を用いて,イージングとスピン交換の相互作用を正確に調整する.

主要な成果:

  • 双極相互作用によって誘導される 調節可能な移動スピンダイナミクス
  • 回転の移行周波数と回転運動結合ダイナミクスの観測されたシフト.
  • スピンのハミルトニアンの完全な調節性を達成し,一貫したスピンダイナミクスの逆転を可能にします.

結論:

  • 強力で調節可能な二極相互作用を持つ新しい相互作用スピンプラットフォームを確立しました.
  • このプラットフォームは,多体スピンダイナミクスとスピン運動物理学の探索を容易にする.
  • 量子磁気と量子情報処理の 研究を可能にします