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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay 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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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.
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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 one, the...
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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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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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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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Controlling spin relaxation with a cavity.

A Bienfait1, J J Pla2, Y Kubo1

  • 1Quantronics Group, SPEC, CEA, CNRS, Université Paris-Saclay, CEA-Saclay, 91191 Gif-sur-Yvette, France.

Nature
|February 16, 2016
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Summary
This summary is machine-generated.

Researchers enhanced spontaneous emission for spins in solids using a superconducting microwave cavity. This significantly boosts spin relaxation rates, enabling on-demand control for quantum information and magnetic resonance applications.

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Area of Science:

  • Quantum physics
  • Solid-state physics
  • Cavity quantum electrodynamics

Background:

  • Spontaneous emission is a fundamental quantum process for system relaxation.
  • Spin relaxation is typically dominated by non-radiative processes due to weak magnetic dipole coupling.
  • The Purcell effect demonstrates enhanced spontaneous emission via resonant cavities.

Purpose of the Study:

  • To investigate the application of the Purcell effect to spins in solids.
  • To achieve spontaneous emission as the dominant spin relaxation mechanism.
  • To enable on-demand control of spin relaxation rates.

Main Methods:

  • Coupling donor spins in silicon to a high-quality superconducting microwave cavity.
  • Tuning spins to the cavity resonance frequency.
  • Measuring spin relaxation rates.

Main Results:

  • Achieved spontaneous emission as the dominant spin relaxation mechanism for spins in solids.
  • Increased spin relaxation rates by three orders of magnitude.
  • Demonstrated on-demand control of energy relaxation.

Conclusions:

  • Spontaneous emission can be controllably enhanced for spins in solids.
  • This technique offers a general method for initializing spin systems.
  • Results pave the way for coherent magnetic coupling of spins to microwave photons.