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Related Concept Videos

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: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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.
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...
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...

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Related Experiment Video

Updated: Jun 24, 2026

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

Increasing hyperpolarized spin lifetimes through true singlet eigenstates.

Warren S Warren1, Elizabeth Jenista, Rosa Tamara Branca

  • 1Department of Chemistry and Center for Molecular and Biomolecular Imaging, Duke University, Durham, NC 27708, USA. warren.warren@duke.edu

Science (New York, N.Y.)
|March 28, 2009
PubMed
Summary
This summary is machine-generated.

Singlet states in molecules can store magnetic resonance imaging signals for minutes, overcoming hyperpolarization

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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate

Published on: September 13, 2019

Area of Science:

  • Magnetic Resonance Imaging
  • Quantum Information Science

Background:

  • Hyperpolarization methods enhance magnetic resonance imaging (MRI) sensitivity for organic molecules by orders of magnitude.
  • However, hyperpolarized signals decay rapidly, typically within seconds, limiting their practical application.
  • Developing methods for longer signal storage is crucial for advanced MRI applications.

Purpose of the Study:

  • To theoretically investigate the potential of singlet states in strongly coupled spins for long-lived population storage in molecules.
  • To experimentally demonstrate the feasibility of using these singlet states for signal retrieval in MRI.

Main Methods:

  • Theoretical analysis of singlet states in strongly coupled spin systems, focusing on conditions for long-lived disconnected eigenstates.
  • Experimental implementation using 2,3-carbon-13-labeled diacetyl.
  • Utilizing hydration to induce inequivalence in the coupled spins for signal readout.

Main Results:

  • Demonstrated theoretically that singlet states can store population in very-long-lived disconnected eigenstates under specific coupling conditions.
  • Experimentally confirmed population storage for minutes in a disconnected eigenstate of 2,3-carbon-13-labeled diacetyl.
  • Successfully retrieved the stored signal via hydration-induced spin inequivalence.

Conclusions:

  • Singlet states offer a promising avenue for extending the lifetime of hyperpolarized signals in MRI.
  • This approach enables population storage for minutes, significantly longer than conventional hyperpolarization methods.
  • The developed technique holds potential for revolutionizing MRI sensitivity and applications in molecular imaging.