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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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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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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...
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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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Updated: Feb 28, 2026

Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Correction: Dynamic nuclear polarization in a magnetic resonance force microscope experiment.

Corinne E Isaac1, Christine M Gleave, Paméla T Nasr

  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, USA. jam99@cornell.edu.

Physical Chemistry Chemical Physics : PCCP
|June 10, 2017
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Summary

This correction clarifies dynamic nuclear polarization (DNP) in magnetic resonance force microscopy (MRFM). It addresses specific details to ensure accurate interpretation of experimental results in nanoscale magnetic sensing.

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Dynamic nuclear polarization (DNP) enhances nuclear spin sensitivity in magnetic resonance.
  • Magnetic Resonance Force Microscopy (MRFM) enables nanoscale magnetic field detection.
  • Accurate DNP implementation is crucial for high-resolution MRFM experiments.

Purpose of the Study:

  • To correct and clarify the experimental details of dynamic nuclear polarization (DNP) as applied in a magnetic resonance force microscope (MRFM).
  • To ensure the reproducibility and accurate interpretation of previous MRFM findings.

Main Methods:

  • Review and re-evaluation of the DNP experimental setup described in the original publication.
  • Detailed explanation of the specific parameters and conditions for optimal DNP performance in MRFM.

Main Results:

  • Identification and correction of specific parameters related to DNP in the MRFM experiment.
  • Clarification of the polarization transfer mechanisms and their efficiency.

Conclusions:

  • The corrected details ensure a more accurate understanding of DNP's role in MRFM.
  • This facilitates improved performance and data interpretation in nanoscale magnetic resonance force microscopy.