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Related Experiment Videos

Inhomogeneous interactions in solids under slow off-magic angle spinning.

S Ding1, J Hu, C Ye

  • 1Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics, Chinese Academy of Sciences.

Solid State Nuclear Magnetic Resonance
|June 1, 1992
PubMed
Summary

Slow off-magic angle spinning (off-MAS) causes chemical shift spectrum distortion. This study analyzes distortion dependence on anisotropy, asymmetry, spinning rate, and angle, showing Total Sideband Separation (TOSS) can partly eliminate it.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Materials Science

Background:

  • Under rapid rotation, solid-state NMR spectra are scaled static spectra.
  • Slow spinning conditions, such as off-magic angle spinning (off-MAS), can introduce spectral distortions.

Purpose of the Study:

  • To investigate the spectral distortion of the central band in inhomogeneous interactions under slow off-MAS.
  • To analyze how anisotropy, asymmetry parameter, spinning rate, and magnetic field angle influence this distortion.
  • To explore methods for mitigating the observed spectral distortions.

Main Methods:

  • Theoretical analysis of spectral line shapes under slow off-MAS conditions.
  • Inclusion of chemical shift anisotropy and asymmetry parameters in the theoretical model.
  • Evaluation of the effect of spinning rate and the angle between the spinning axis and magnetic field.

Related Experiment Videos

  • Application and assessment of Total Sideband Separation (TOSS) technique.

    • Main Results:

    • The central band under slow off-MAS is not a simple scaled static spectrum, indicating significant distortion.
    • Spectral distortion is dependent on chemical shift anisotropy, asymmetry parameter, spinning rate, and the angle of rotation.
    • Total Sideband Separation (TOSS) can partially correct these distortions in specific scenarios.

    Conclusions:

    • Slow off-MAS introduces complex spectral distortions not present under rapid spinning.
    • Understanding these distortions is crucial for accurate spectral interpretation in solid-state NMR.
    • TOSS offers a potential, albeit partial, solution for mitigating spectral distortion under certain off-MAS conditions.