Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

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

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Reconfigurable Multistate Optical Memory in Mixed Halide Perovskites.

ACS applied materials & interfaces·2026
Same author

Grand Challenges and Opportunities in Stimulated Dynamic and Resonant Catalysis.

ACS catalysis·2026
Same author

Ion migration in perovskite solar cells.

Nature reviews. Chemistry·2026
Same author

Polariton condensate far-detuned from exciton resonance in WS<sub>2</sub> bound states in the continuum.

Nature communications·2025
Same author

Excitation Intervals Enhance Performance in Perovskite Solar Cells.

ACS applied materials & interfaces·2025
Same author

Intensity-Modulated Photoluminescence Spectroscopy for Revealing Ionic Processes in Halide Perovskites.

ACS energy letters·2025

Video Experimental Relacionado

Updated: Feb 15, 2026

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
11:03

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy

Published on: July 14, 2022

4.1K

Interfaz de fotón y valle quiral a nanoescala a través del acoplamiento óptico de espín y órbita

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
Resumen

Demostramos el acoplamiento de luz direccional dependiente del valle en disulfuro de tungsteno (WS2) utilizando nanocables plasmónicos. Esto permite un control preciso a nanoescala y la detección de información sobre el valle y el giro con un 90% de eficiencia.

Más Videos Relacionados

3D Orbital Tracking in a Modified Two-photon Microscope: An Application to the Tracking of Intracellular Vesicles
11:28

3D Orbital Tracking in a Modified Two-photon Microscope: An Application to the Tracking of Intracellular Vesicles

Published on: October 1, 2014

10.7K
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

17.6K

Videos de Experimentos Relacionados

Last Updated: Feb 15, 2026

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
11:03

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy

Published on: July 14, 2022

4.1K
3D Orbital Tracking in a Modified Two-photon Microscope: An Application to the Tracking of Intracellular Vesicles
11:28

3D Orbital Tracking in a Modified Two-photon Microscope: An Application to the Tracking of Intracellular Vesicles

Published on: October 1, 2014

10.7K
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

17.6K

Área de la Ciencia:

  • Física de la materia condensada
  • Ciencias de los materiales
  • Nanotecnología

Sus antecedentes:

  • Los dicalcogenuros de metales de transición bidimensionales exhiben propiedades de valle únicas.
  • Valleytronics utiliza el pseudospin del valle para la codificación y detección de información.
  • El control óptico de la información del valle es crucial para la electrónica de próxima generación.

Objetivo del estudio:

  • Para demostrar el acoplamiento direccional de la luz dependiente del valle.
  • Investigar la interacción entre los nanocables plasmónicos y las capas WS2.
  • Para establecer una plataforma a nanoescala para el valle y la manipulación de la información de giro.

Principales métodos:

  • Fabricación de una heterostructura plasmónica de disulfuro de nano alambre de tungsteno (WS2).
  • Utilizando el momento angular de giro de la luz para la codificación de información del valle.
  • Medición de la eficiencia de acoplamiento direccional de la luz con el pseudospin del valle WS2.

Principales resultados:

  • Se logra el acoplamiento direccional dependiente del valle de la luz con WS2.
  • Se ha demostrado un acoplamiento eficiente (90 ± 1%) entre el pseudospin del valle WS2 y el spin óptico transversal.
  • Validación de la interacción selectiva entre la luz y los estados del valle WS2.

Conclusiones:

  • El sistema plasmónico nanowire-WS2 ofrece una plataforma robusta para la valleytrónica.
  • El control óptico preciso sobre el valle y la información de giro a nanoescala es posible.
  • Este trabajo allana el camino para nuevos dispositivos optoelectrónicos que utilizan valles y grados de libertad de giro.