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関連する概念動画

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

982
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...
982
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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
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
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

44.3K
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:
44.3K
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

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関連する実験動画

Updated: Aug 20, 2025

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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電子エンタグラーにおけるスピン交差相関実験

Arunav Bordoloi1,2, Valentina Zannier3, Lucia Sorba3

  • 1Department of Physics, University of Basel, Basel, Switzerland. bordoloi@umd.edu.

Nature
|November 24, 2022
PubMed
まとめ
この要約は機械生成です。

研究者はクーパーペアから電子スピン相関を直接測定し,スピン絡み合いのシングレット状態の理論的予測を確認した. この突破は新しいナノ電子回転相関実験を可能にします

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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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関連する実験動画

Last Updated: Aug 20, 2025

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
08:44

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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科学分野:

  • 量子物理学
  • 凝縮物質物理学
  • ナノテクノロジー

背景:

  • コレレーションは多体系を理解するために不可欠ですが,特に電子のスピンについては,顕微鏡レベルで測定することは困難です.
  • 理論的には,クーパーペアの電子は最大スピン絡み合いのシングレット状態を形成することが知られているが,実験的な検証は欠けている.

研究 の 目的:

  • クーパー・ペア・スプリッターから放出される電子電流の間のスピン・クロス・コレレーションを直接測定する.
  • クーパー対の電子のスピン絡み合いの単体状態を実験的に検証する.

主な方法:

  • クーパー・ペアから電子を放出する クーパー・ペア・スプリッター装置を使用した.
  • 量子ドットにおける電子のスピンを極化するために,調節可能なスピンフィルターとしてフェロマグネティック・スプリット・ゲートを採用した.
  • 標準トランスポートと敏感なトランスコンダクタンス測定を用いてスピンクロス相関を検出した.

主要な成果:

  • 直接測定された負のスピン・クロス・コレレーションは,スピン・シングレット・エミッションと一致する.
  • ゼーマン分割量子ドット状態の重複に起因する理想値からの観測偏差.

結論:

  • ナノ電子機器でスピン相関実験を行うための新しい方法を示した.
  • このテクニックは,磁場に敏感な超伝導体や,巨大な粒子のベルテストに適しています.