Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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

Spin–Spin Coupling: One-Bond Coupling

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

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

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

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

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...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Age-specific patterns of lymph node involvement in elderly patients with oral squamous cell carcinoma: a retrospective cohort study.

Clinical oral investigations·2026
Same author

Diagnosis, treatment and monitoring of chronic nonbacterial osteomyelitis (CNO) and chronic recurrent multifocal osteomyelitis (CRMO) - Evidence, practice and consensus-based recommendations from the German pediatric rheumatology society (GKJR).

Autoimmunity reviews·2026
Same author

Barriers to accessing and using preventive mental health services for psychosocially strained children and families in Germany: Perspectives of professionals from different sectors.

Preventive medicine·2025
Same author

Diagnosis and Treatment of Hypophosphatasia.

Calcified tissue international·2025
Same author

At-Home Administration of Gantenerumab by Care Partners to People with Early Alzheimer's Disease: Feasibility, Safety and Pharmacodynamic Impact.

The journal of prevention of Alzheimer's disease·2024
Same author

Monolithic high contrast grating on GaSb/AlAsSb based epitaxial structures for mid-infrared wavelength applications.

Optics express·2023

関連する実験動画

Updated: Jul 14, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

単一の量子ドット半導体マイクロキャビティシステムの強いカップリング

J P Reithmaier1, G Sek, A Löffler

  • 1Technische Physik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.

Nature
|November 13, 2004
PubMed
まとめ

研究者は,半導体マイクロキャビティ内の単一の量子ドットと光子との強い結合を達成しました. 洞穴量子電動学のこの重要な進歩は,可逆的なエネルギー交換を示し,量子情報処理の道を開く.

さらに関連する動画

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

関連する実験動画

Last Updated: Jul 14, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

科学分野:

  • 光学と固体物理学の分野
  • 洞穴量子電動力学 (CQED) とは

背景:

  • CQEDは,光学空洞の原子のようなエミターを研究し,弱い結合と強い結合を区別する.
  • 弱いカップリングは自発的な放出を修正し,強いカップリングは放出器と空洞モードの間の可逆的なエネルギー交換を可能にします.
  • 以前は,強い結合は大きな穴の原子に限られていた.

研究 の 目的:

  • 単一の固体エミッターと空洞フォトンとの強い結合を証明するために.
  • 量子情報処理と一貫した制御における潜在的な応用を探求する.

主な方法:

  • 固体エミッターとして単一の量子ドットを使用した.
  • 半導体マイクロキャビティを使用して,光子を閉じ込めました.
  • 特徴的な反交差点のための光発光データを分析した.

主要な成果:

  • 単一の量子ドットエクシトンと空洞モードの強い結合が観察されました.
  • 約140マイクロVの真空ラビ分裂を測定しました.
  • 分散関係における反交差が実証され,一貫した結合が確認された.

結論:

  • 固体系において強い結合を達成し,原子系を超えた重要な進歩となった.
  • 観測されたコヒーレントカップリングは,量子技術の新たな道を開く.
  • この研究は,将来の量子情報処理アプリケーションのための基盤を確立します.