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関連する概念動画

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
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,...
1.5K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.7K
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...
1.7K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.5K
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...
1.5K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.3K
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...
3.3K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
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...
1.5K
Electron Orbital Model01:18

Electron Orbital Model

73.3K
Orbitals are the areas outside of the atomic nucleus where electrons are most likely to reside. They are characterized by different energy levels, shapes, and three-dimensional orientations. The location of electrons is described most generally by a shell or principal energy level, then by a subshell within each shell, and finally, by individual orbitals found within the subshells.
The first shell is closest to the nucleus, and it has only one subshell with a single spherical orbital called the...
73.3K

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Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
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光学スピン軌道結合によるナノスケールキラルバレー-光子インターフェース

Su-Hyun Gong1,2, Filippo Alpeggiani1,2, Beniamino Sciacca2

  • 1Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.

Science (New York, N.Y.)
|January 27, 2018
PubMed
まとめ

プラズモンのナノワイヤーを用いて,硫黄二酸化物 (WS2) での谷間依存型方向光結合を実証しました. これはナノスケールの正確な制御と 90%の効率でバレーとスピン情報を検出します.

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • ナノテクノロジー

背景:

  • 二次元の移行金属二カルコゲニドは 独特の谷物特性を持っています
  • ヴァレートロニクスでは 情報の暗号化と検出のために ヴァレー・シュードスピンを利用しています
  • 谷間情報の光学制御は 次世代の電子機器にとって不可欠です

研究 の 目的:

  • 渓谷依存の方向性照明を証明する.
  • プラズモンのナノワイヤとWS2層の相互作用を調査する.
  • 谷間とスピン情報操作のためのナノスケールプラットフォームを確立します.

主な方法:

  • プラズモンのナノワイヤ-タングステンジスルファイド (WS2) ヘテロ構造の製造.
  • 光のスピン角度モメンタムを利用して 谷間情報をコードする.
  • WS2バレーのシドスピンで光の方向結合効率を測定する.

主要な成果:

  • WS2との渓谷依存の方向性カップリングを達成した.
  • WS2バレーのシドスピンと横の光学スピンとの間の効率的なカップリング (90 ± 1%) が実証されています.
  • 光とWS2バレー状態の間の手性選択的相互作用を検証した.

結論:

  • プラズモニックナノワイヤWS2システムは,バレートロニクスのための堅牢なプラットフォームを提供します.
  • ナノスケールでのバレーとスピン情報に対する正確な光学制御は達成可能である.
  • この研究は,バレーとスピンの自由度を利用した新しい光電子装置の道を開く.