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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

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 have a...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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.
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...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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,...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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 one, the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.

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Related Experiment Video

Updated: Jun 1, 2026

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
08:55

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

Published on: October 9, 2020

Rapid and robust spin state amplification.

Tom Close1, Femi Fadugba, Simon C Benjamin

  • 1Department of Materials, Oxford University, Oxford, United Kingdom. tom.close@materials.ox.ac.uk

Physical Review Letters
|May 24, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to amplify single spin states using ancillary spins in a lattice. This quantum technology advancement overcomes challenges in measuring individual spins for real-world applications.

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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

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Area of Science:

  • Quantum Technology
  • Quantum Information Science
  • Spin Physics

Background:

  • Electron and nuclear spins are foundational to early quantum technology demonstrations.
  • A major limitation for real-world quantum technology is the difficulty in measuring single spins.
  • Robust single-spin measurement is crucial for advancing quantum computing and sensing.

Purpose of the Study:

  • To demonstrate a method for rapid and robust amplification of single spin states.
  • To explore the feasibility of using ancillary spins in a lattice for spin amplification.
  • To investigate the performance of this amplification technique under realistic conditions, including finite temperature and decoherence.

Main Methods:

  • Utilized a homogenous Ising-coupled spin lattice model in 1, 2, and 3 dimensions.
  • Applied a continuous microwave field to drive the spin lattice.
  • Simulated the spin state amplification process considering finite temperature and various decoherence effects.

Main Results:

  • Successfully showed that a lattice of ancillary spins can rapidly and robustly amplify a target spin state.
  • Confirmed the amplification process is effective even with imperfect initial polarization (finite temperature).
  • Demonstrated the resilience of the amplification method against different forms of decoherence.

Conclusions:

  • The proposed ancillary spin lattice method offers a viable solution for overcoming single-spin measurement challenges in quantum technology.
  • This technique provides a pathway for more practical and scalable quantum devices by enabling robust spin state amplification.
  • The model's simplicity and robustness at finite temperatures and under decoherence make it highly promising for experimental implementation.