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Related Concept Videos

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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Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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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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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Nuclei: Nuclear Spin01:08

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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Hyperpolarized Xenon for NMR and MRI Applications
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Spinning-Driven Dynamic Nuclear Polarization with Optical Pumping.

Krishnendu Kundu1, Thierry Dubroca1, Vinayak Rane2

  • 1National High Magnetic Field Laboratory, Florida State University, 1800 E Paul Dirac Drive, Tallahassee, Florida 32310, United States.

The Journal of Physical Chemistry. A
|April 13, 2022
PubMed
Summary
This summary is machine-generated.

We developed a novel solid-state nuclear spin hyperpolarization technique. This method enhances nuclear spin polarization without microwaves, potentially reducing costs and improving performance at high magnetic fields.

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Area of Science:

  • Solid-state physics
  • Quantum chemistry
  • Magnetic resonance imaging

Background:

  • Dynamic Nuclear Polarization (DNP) enhances nuclear spin polarization for improved sensitivity in magnetic resonance.
  • Conventional DNP often relies on microwave irradiation, which can be costly and less effective at high magnetic fields.
  • Current methods face limitations in performance scaling with increasing magnetic field strength.

Purpose of the Study:

  • To introduce a new, efficient, and cost-effective solid-state nuclear spin hyperpolarization method.
  • To combine the cross-effect mechanism with electron spin optical hyperpolarization.
  • To achieve significant nuclear spin polarization enhancements without microwave irradiation, especially at high magnetic fields.

Main Methods:

  • Demonstration of optical hyperpolarization in the solid state at low temperatures and low fields.
  • Investigation of field dependence for optimal high-field electron spin hyperpolarization.
  • Incorporation of results into advanced magic-angle spinning (MAS) DNP numerical simulations.

Main Results:

  • Optical hyperpolarization achieved in the solid state.
  • Identification of optimal conditions for high-field electron spin hyperpolarization.
  • Simulations predict breakthrough enhancements (>658 for 1H) at very high magnetic fields without microwave irradiation.

Conclusions:

  • Optically pumped MAS-DNP offers a promising alternative to conventional microwave-based DNP.
  • This method could overcome the performance decrease of MAS-DNP at high magnetic fields.
  • Potential for reduced instrument costs and enhanced capabilities in magnetic resonance applications.