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Related Experiment Videos

Frequency offset refocused PISEMA-type sequences.

Sergey V Dvinskikh1, Dick Sandström

  • 1Division of Physical Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden. sergey@physc.su.se

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|June 14, 2005
PubMed
Summary

This study introduces a modified pulse scheme to suppress frequency offset errors in the PISEMA experiment, improving accuracy for solid-state NMR. The new method enhances spectral quality by mitigating interfering terms in the FSLG-CP sequence.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Materials science

Background:

  • The widely used PISEMA experiment is sensitive to proton (1H) chemical shift dispersion and carrier frequency selection.
  • This sensitivity arises from off-resonance 1H irradiation within the Fast Amplitude-Modulated Lee-Goldburg Cross-Polarization (FSLG-CP) sequence during the dipolar evolution period.

Purpose of the Study:

  • To develop a modified pulse scheme for the PISEMA experiment that suppresses interfering frequency offset terms.
  • To enhance the accuracy and spectral quality of solid-state NMR measurements.

Main Methods:

  • Implementation of new pulse schemes incorporating 180-degree pulses applied simultaneously to both frequency channels.
  • Orthogonal phase settings for these pulses relative to spin-lock fields within the FSLG-CP sequence.

Related Experiment Videos

  • Demonstration on a nematic liquid-crystalline sample.

    • Main Results:

    • Successful suppression of interfering frequency offset terms.
    • Improved spectral resolution and accuracy in PISEMA experiments.
    • Demonstrated applicability to nematic liquid crystals.

    Conclusions:

    • The modified pulse scheme effectively overcomes the limitations of conventional FSLG-CP in PISEMA.
    • This technique offers a more robust approach for solid-state NMR studies, particularly for systems sensitive to frequency offsets.
    • Potential extensions to amplitude-modulated FSLG-CP recoupling under magic angle spinning (MAS) were presented.