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Spin–Spin Coupling Constant: Overview

Spin–Spin Coupling Constant: Overview

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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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)

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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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...

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

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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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Related Experiment Video

Updated: Jun 13, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Strong Spin-Motion Coupling in the Ultrafast Dynamics of Rydberg Atoms.

V Bharti¹, S Sugawa^1,2,3, M Kunimi⁴

¹<a href="https://ror.org/04wqh5h97">Institute for Molecular Science</a>, National Institutes of Natural Sciences, Okazaki 444-8585, Japan.

Physical Review Letters

|September 13, 2024

Summary

Researchers discovered strong spin-motion coupling in Rydberg atoms within optical lattices. This finding reveals new ways to explore quantum spin systems by incorporating atomic motion into simulations.

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Area of Science:

Quantum simulation
Atomic physics
Condensed matter physics

Background:

Rydberg atoms in optical lattices and tweezers are established for quantum spin system simulations.
The experimental role of the atoms' spatial wave function in these systems remains underexplored.

Purpose of the Study:

To experimentally investigate the influence of the atomic spatial wave function on quantum spin dynamics.
To demonstrate and characterize spin-motion coupling in Rydberg atoms.
To propose a method for controlling spin-motion coupling strength.

Main Methods:

Utilizing Rydberg atoms excited to an S state via picosecond pulses.
Employing an atomic Mott-insulator with unity filling.
Observing ultrafast many-body nanosecond dynamics.

Main Results:

Observed strong spin-motion coupling due to interaction potential variations over the wave function.
Detected clear signatures of this coupling on the system's nanosecond dynamics.
Proposed a method to tune spin-motion coupling relative to motional energy scales.

Conclusions:

Spin-motion coupling is a significant factor in Rydberg atom quantum simulations.
The study introduces a new degree of freedom (motion) for Rydberg simulations.
This work opens avenues for exploring strongly correlated quantum systems dynamics.