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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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 have a...
The Colloidal State01:29

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
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)

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Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

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Video Experimental Relacionado

Updated: Jun 11, 2026

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Published on: August 10, 2017

Adaptación de las interacciones luz-materia-espín en nanoestructuras heterocolloidales coloidales.

Jiatao Zhang1, Yun Tang, Kwan Lee

  • 1Department of Physics and Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA.

Nature
|July 3, 2010
PubMed
Resumen

Los investigadores lograron un significativo efecto Stark óptico en nanoestructuras sin cavidades. Este avance permite la manipulación de espín coherente en nanomateriales coloidales para el procesamiento de información cuántica.

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Área de la Ciencia:

  • Óptica y Fotónica.
  • Ciencia de los materiales Ciencia de los materiales.
  • Ciencias de la información cuántica Ciencias de la información cuántica.

Sus antecedentes:

  • Las interacciones luz-materia son fundamentales para muchos procesos y aplicaciones.
  • El efecto Stark óptico de aire acondicionado (OSE) permite un control cuántico coherente de los espines en semiconductores para dispositivos cuánticos.
  • El acoplamiento de materia ligera a nanoescala suele estar debilitado, lo que limita las aplicaciones.

Objetivo del estudio:

  • Para lograr una OSE considerable con una desvinculación de energía sustancial en una nanoestructura sin cavidades.
  • Para demostrar una manipulación de espín ultrarrápida coherente dentro de las nanoestructuras coloidales.
  • Para explorar la adaptación de OSE y la manipulación de espín a través de la resonancia plasmon-excitón.

Principales métodos:

  • Fabricación de las hetero-nanoestructuras del núcleo-capa del semiconductor de metal coloidal.
  • Ajuste de la resonancia plasmónica de la superficie del metal para que coincida espectralmente con las transiciones de excitón del semiconductor.
  • Investigando la dependencia de polarización del OSE.

Principales resultados:

  • Se logró una OSE considerable en una nanoestructura sin cavidades con una desajuste de energía sustancial.
  • El OSE resonancialmente mejorado exhibió dependencia de polarización.
  • Se ha demostrado una manipulación coherente de espín ultrarrápido en nanoestructuras coloidales.

Conclusiones:

  • El acoplamiento resonante plasmón-excitón en nanoestructuras diseñadas permite interacciones de luz-materia-espín a medida.
  • Este enfoque proporciona una vía para el procesamiento de información cuántica a nanoescala.
  • Estas nanoestructuras pueden servir como bancos de pruebas para nano-biofotónica y nano-energía.