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Related Concept Videos

NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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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: 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.
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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Search for exotic spin-dependent interactions with a spin-based amplifier.

Haowen Su1,2,3, Yuanhong Wang1,2,3, Min Jiang1,2,3

  • 1Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

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Summary
This summary is machine-generated.

Scientists developed a new spin-based amplifier technique to search for exotic spin- and velocity-dependent interactions beyond the standard model. This method significantly improves constraints on these fundamental particle physics interactions.

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Area of Science:

  • * Particle Physics
  • * Beyond Standard Model Physics
  • * Nuclear Physics

Background:

  • * Understanding the ultraviolet completion of particle physics requires new search techniques for hypothetical particles.
  • * Exotic particles may mediate spin-dependent interactions, but laboratory searches often focus on static or limited velocity-dependent interactions.
  • * Existing experimental methods have limitations in probing certain exotic interactions.

Purpose of the Study:

  • * To develop and demonstrate a novel technique for searching for spin- and velocity-dependent interactions.
  • * To utilize hyperpolarized nuclear spins as an amplifier for exotic interaction-mediated pseudo-magnetic fields.
  • * To establish new constraints on specific beyond-standard-model interactions.

Main Methods:

  • * Employed a spin-based amplifier utilizing hyperpolarized nuclear spins.
  • * Amplified pseudo-magnetic fields generated by exotic interactions by over 100 times.
  • * Conducted laboratory searches for spin- and velocity-dependent interactions between polarized neutrons and unpolarized nucleons.

Main Results:

  • * Established new constraints on spin- and velocity-dependent interactions for a force range of 0.03 to 100 meters.
  • * Improved previous experimental constraints by at least two orders of magnitude in specific force ranges.
  • * Demonstrated the efficacy of the spin-based amplifier technique for probing exotic interactions.

Conclusions:

  • * The developed spin-based amplifier technique is effective for searching for exotic spin-dependent interactions.
  • * The study provides significantly improved constraints on spin- and velocity-dependent interactions.
  • * The technique holds potential for investigating other exotic spin-dependent interactions in particle physics.