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Videos de Conceptos Relacionados

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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

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

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

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

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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

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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...
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Titration Calculations: Strong Acid - Strong Base02:28

Titration Calculations: Strong Acid - Strong Base

34.2K
Calculating pH for Titration Solutions: Strong Acid/Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
34.2K

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Fuerte acoplamiento de fotones de espín en silicio

N Samkharadze1, G Zheng1, N Kalhor1

  • 1QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.

Science (New York, N.Y.)
|January 27, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores acoplaron un solo espín de electrón en un punto cuántico de silicio a un fotón de microondas. Esto demuestra un paso clave hacia la ampliación de las computadoras cuánticas utilizando qubits de espín.

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Área de la Ciencia:

  • Ciencia de la información cuántica
  • Física del estado sólido
  • Circuitos superconductores

Sus antecedentes:

  • Los giros individuales en los puntos cuánticos de silicio ofrecen largos tiempos de coherencia, lo que los hace prometedores para la computación cuántica.
  • La ampliación de los sistemas de qubits de espín es un desafío significativo en el desarrollo de computadoras cuánticas prácticas.

Objetivo del estudio:

  • Para demostrar un fuerte acoplamiento entre un solo espín de electrones y un solo fotón de microondas.
  • Establecer un paso fundamental para la arquitectura escalable de las redes de qubits de espín basadas en puntos cuánticos.

Principales métodos:

  • Atrapar un espín de un solo electrón dentro de un punto cuántico doble de silicio.
  • Utilizando un resonador superconductor de alta impedancia en el chip para almacenar un solo fotón de microondas.
  • Aprovechando el campo eléctrico del fotón de la cavidad para acoplarse con el dipolo de carga del electrón e indirectamente con su espín a través de un gradiente de campo magnético localizado.

Principales resultados:

  • Se logró un fuerte acoplamiento entre el espín de un solo electrón y el fotón de microondas.
  • Demostró un mecanismo de interacción controlable mediado por componentes de campo eléctrico y magnético.

Conclusiones:

  • El fuerte acoplamiento demostrado proporciona una vía viable para interfazar puntos cuánticos.
  • Este trabajo es un paso crucial hacia la construcción de registros cuánticos escalables para la computación cuántica.