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Related Concept Videos

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

742
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...
742
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

709
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.
709
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
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 Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
1.4K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

1.1K
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.
1.1K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

469
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Hyperpolarized Xenon for NMR and MRI Applications
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High field magnetometry with hyperpolarized nuclear spins.

Ozgur Sahin1, Erica de Leon Sanchez1, Sophie Conti1

  • 1Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA.

Nature Communications
|September 19, 2022
PubMed
Summary

Researchers developed a high-field spin magnetometer using hyperpolarized diamond spins for advanced Nuclear Magnetic Resonance (NMR) spectroscopy. This quantum sensor achieves high spectral resolution and sensitivity, enabling new microscale chemical sensing applications.

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Area of Science:

  • Quantum Sensing
  • Spectroscopy
  • Materials Science

Background:

  • Sub-micronscale Nuclear Magnetic Resonance (NMR) spectroscopy requires advanced quantum sensors.
  • High magnetic fields are advantageous for high-resolution spectroscopy due to enhanced chemical shift discrimination.
  • Existing quantum sensors often operate at low magnetic fields, limiting their spectroscopic capabilities.

Purpose of the Study:

  • To demonstrate a high-field spin magnetometer for enhanced NMR spectroscopy.
  • To leverage hyperpolarized nuclear spins in diamond for quantum sensing applications.
  • To explore the potential of microscale NMR chemical sensors.

Main Methods:

  • Construction of a high-field spin magnetometer using an ensemble of hyperpolarized 13C nuclear spins in diamond.
  • Initialization and protection of nuclear spins using Nitrogen Vacancy (NV) centers.
  • Detection of time-varying (AC) magnetic fields via secondary spin precessions.

Main Results:

  • Demonstrated quantum sensing at a high magnetic field of 7 Tesla (7T).
  • Achieved a detection bandwidth of up to 7 kHz.
  • Obtained a spectral resolution below 100 mHz and single-shot sensitivity of 410 pT/√Hz.

Conclusions:

  • The developed high-field spin magnetometer shows promise for microscale NMR chemical sensors using hyperpolarized nanodiamonds.
  • The study highlights potential applications of dynamic nuclear polarization (DNP) in advancing quantum sensing technologies.
  • This work bridges the gap between high-field NMR requirements and quantum sensing capabilities.