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Double resonance probes for close frequencies

J Haase1, N J Curro, C P Slichter

  • 1Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois, 61801-3080, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 8, 1999
PubMed
Summary

A novel double resonance probe for nuclear magnetic resonance (NMR) experiments enables precise measurements in systems with similar frequencies. This new design, using coupled resonators, offers performance comparable to single resonance circuits with fewer tuning elements.

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Area of Science:

  • Materials Science
  • Physics
  • Chemistry

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful tool for characterizing materials.
  • Systems with close resonance frequencies pose challenges for traditional NMR probes.
  • High-temperature superconductors are complex materials requiring advanced characterization techniques.

Purpose of the Study:

  • To introduce a new double resonance probe design for NMR experiments.
  • To address the challenge of analyzing systems with close resonance frequencies.
  • To evaluate the probe's performance in characterizing complex materials like superconductors.

Main Methods:

  • The study introduces a new double resonance probe design featuring two coupled resonators.
  • The probe was tested using double resonance NMR experiments on magnetically aligned powders of high-temperature superconductors.

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  • Experiments involved measurements between different isotopes (65Cu and 63Cu) and different magnetic quantum number transitions of the same spin.

    • Main Results:

    • The new probe design effectively handles systems with close resonance frequencies.
    • Performance of the double resonance probe closely approaches that of a single resonance circuit.
    • The probe design incorporates only 4 variable tuning/matching elements, simplifying operation.

    Conclusions:

    • The developed double resonance probe is highly effective for NMR studies of systems with close resonance frequencies.
    • The probe's design offers a significant advantage in terms of performance and simplicity.
    • This technology can advance the study of complex materials, including high-temperature superconductors.