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Related Concept Videos

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

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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...
1.3K
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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NMR Spectroscopy: Spin–Spin Coupling01:08

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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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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Bose-Einstein condensates with cavity-mediated spin-orbit coupling.

Y Deng1, J Cheng2, H Jing3

  • 1State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100190, China.

Physical Review Letters
|April 29, 2014
PubMed
Summary
This summary is machine-generated.

We introduce a new method to create spin-orbit coupling in atomic condensates using laser light within an optical cavity. This technique generates quantum phases and a synthetic magnetic field, aiding quantum Hall effect research in ultracold gases.

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Area of Science:

  • Atomic, Molecular & Optical Physics
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Spin-orbit coupling is crucial for understanding exotic quantum phenomena.
  • Optical cavities offer a controlled environment for manipulating quantum states.
  • Ultracold atomic gases provide a versatile platform for simulating complex physical systems.

Purpose of the Study:

  • To propose a novel scheme for generating spin-orbit coupling in a Bose-Einstein condensate.
  • To explore the quantum phases arising from light-matter interactions in an optical cavity.
  • To create a large synthetic magnetic field for ultracold atomic gases.

Main Methods:

  • Utilizing a combination of standing and traveling laser waves.
  • Placing a Bose-Einstein condensate within an optical cavity.
  • Analyzing the quantum phases and synthetic magnetic fields generated by the proposed scheme.

Main Results:

  • Successfully generated spin-orbit coupling for the condensate.
  • Observed rich quantum phases due to the interplay of laser light and the optical cavity.
  • Created a significant synthetic magnetic field for the dressed spin state.

Conclusions:

  • The proposed scheme offers a new pathway to engineer spin-orbit coupling in controlled quantum systems.
  • The generated quantum phases and synthetic magnetic field are promising for fundamental physics research.
  • This method may facilitate experimental studies of the quantum Hall effect in ultracold atomic gases.