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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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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...
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Spin–Spin Coupling Constant: Overview01:08

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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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Spin–Spin Coupling: One-Bond Coupling01:17

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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

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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

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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...
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El acoplamiento de espín-órbita en gases cuánticos.

Victor Galitski1, Ian B Spielman

  • 1Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA.

Nature
|February 8, 2013
PubMed
Resumen
Este resumen es generado por máquina.

El acoplamiento de órbita de espín sintético en átomos ultrafríos ofrece un control sintonizable, lo que permite una investigación única en física cuántica. Esta revisión cubre los avances experimentales y teóricos en el acoplamiento de órbita de espín de ingeniería para la nueva física.

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Área de la Ciencia:

  • La física cuántica es la física cuántica.
  • Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada
  • La física atómica es la física atómica.

Sus antecedentes:

  • El acoplamiento de espín-órbita (SOC) es fundamental para los fenómenos de materia condensada como los aislantes topológicos.
  • En los sólidos, el SOC surge de campos eléctricos intrínsecos, lo que limita la atonibilidad.
  • Los sistemas atómicos ultrafríos ofrecen una plataforma única para la ingeniería de SOC sintéticos.

Objetivo del estudio:

  • Revisar el estado actual del acoplamiento de espín-órbita en sistemas atómicos ultrafríos.
  • Para resaltar la física única habilitada por el SOC diseñado en estos sistemas.
  • Para discutir los avances experimentales y teóricos.

Principales métodos:

  • Utilizando campos láser para diseñar acoplamientos sintéticos de espín-órbita en átomos ultrafríos.
  • Explorando los "parámetros materiales" sintonizables en los sistemas atómicos.
  • Modelado teórico y realización experimental de nuevos fenómenos SOC.

Principales resultados:

  • Demostración de acoplamiento de órbita de espín sintético controlable en gases atómicos ultrafríos.
  • Observación de fenómenos cuánticos únicos no accesibles en sistemas de estado sólido.
  • Avances en los marcos teóricos para la comprensión de los SOC diseñados.

Conclusiones:

  • Los átomos ultrafríos proporcionan una plataforma sin precedentes para estudiar el acoplamiento de espín-órbita.
  • El SOC de ingeniería permite la exploración de nuevos estados y fenómenos cuánticos.
  • Las futuras direcciones de investigación en SOC sintético para la física fundamental son prometedoras.