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NMR Spectrometers: Resolution and Error Correction01:14

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Paramagnetic shimming for wide-range variable-field NMR.

Naoki Ichijo1, Kazuyuki Takeda1, K Takegoshi1

  • 1Division of Chemistry, Graduate School of Science, Kyoto University, 606-8502 Kyoto, Japan.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 1, 2014
PubMed
Summary
This summary is machine-generated.

We introduce a novel paramagnetic shimming technique for variable-field Nuclear Magnetic Resonance (NMR) experiments. This method enhances magnetic field homogeneity, enabling high-resolution NMR across various magnetic fields.

Keywords:
NMR elemental analysisParamagnetic shimmingPassive shimmingShimmingVariable-field superconducting magnet

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Area of Science:

  • Magnetic Resonance Imaging
  • Spectroscopy
  • Materials Science

Background:

  • Variable-field Nuclear Magnetic Resonance (NMR) experiments require precise magnetic field homogeneity.
  • Achieving consistent field homogeneity across a range of magnetic field strengths presents a significant challenge.

Purpose of the Study:

  • To develop and demonstrate a new passive shimming strategy for variable-field NMR.
  • To improve magnetic field homogeneity in variable-field NMR experiments using paramagnetic materials.

Main Methods:

  • Proposed a passive shimming strategy utilizing paramagnetic shim pieces within the magnet bore.
  • Demonstrated the technique in Lithium-7 (7Li), Rubidium-87 (87Rb), and Scandium-45 (45Sc) NMR.
  • Conducted experiments at magnetic fields of 3.4, 4.0, and 5.4 Tesla with a fixed carrier frequency of 56.0 MHz.

Main Results:

  • The paramagnetic shimming effectively compensated for magnetic field inhomogeneity.
  • Consistent line narrowing was observed across different magnetic field strengths.
  • The effectiveness of shimming was independent of the main-magnet current due to proportional relationships.

Conclusions:

  • Paramagnetic shimming offers a viable solution for enhancing field homogeneity in variable-field NMR.
  • This technique facilitates high-resolution NMR experiments over a wide range of magnetic fields.
  • The proposed method provides an effective and passive approach to NMR shimming.