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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

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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.
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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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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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The Electromagnetic Spectrum02:37

The Electromagnetic Spectrum

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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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Electromagnetically induced transparency in a spin-orbit coupled Bose-Einstein condensate.

Zhengfeng Hu, Chengpu Liu, Jin-Ming Liu

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    |August 19, 2018
    PubMed
    Summary

    This study explores electromagnetically induced transparency (EIT) in spin-orbit (SO) coupled Bose-Einstein condensates (BECs). Researchers found that SO coupling causes a measurable frequency shift in the EIT spectrum, enabling detection and measurement of SO coupling strength.

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    Area of Science:

    • Quantum physics
    • Condensed matter physics
    • Atomic physics

    Background:

    • Bose-Einstein condensates (BECs) are crucial for simulating complex condensed matter phenomena.
    • Spin-orbit (SO) coupling significantly alters the optical properties of BECs.
    • Electromagnetically induced transparency (EIT) offers a non-destructive method for probing atomic properties.

    Purpose of the Study:

    • To investigate the effects of SO coupling on EIT in BECs.
    • To explore the potential of EIT as a tool for detecting and measuring SO coupling strength.

    Main Methods:

    • Theoretical investigation of EIT in a BEC with SO coupling.
    • Analysis of the susceptibility's real and imaginary parts within the EIT spectrum.

    Main Results:

    • EIT is observed in SO-coupled BECs.
    • A red frequency shift in the EIT spectrum is detected, directly proportional to SO coupling strength.
    • This shift provides a sensitive and unconventional method for SO coupling measurement.

    Conclusions:

    • SO coupling can be accurately detected and quantified using EIT spectrum shifts in BECs.
    • This research offers a novel approach for characterizing SO coupling in quantum systems.