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Spin counting with fast MAS

Geen1, Graf, Heindrichs

  • 1Department of Physics, Department of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 18, 1999
PubMed
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A new multiple-quantum spin counting experiment using magic angle spinning (MAS) allows for faster measurements and detailed observation of spin dynamics. This advanced technique accurately determines dipolar-coupled spin cluster sizes, improving upon older methods.

Area of Science:

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

Background:

  • Traditional spin counting experiments often require slow magic angle spinning (MAS) rates.
  • Previous methods lacked the temporal resolution to observe fast multiple-quantum excitation dynamics.
  • Accurate determination of dipolar-coupled spin cluster sizes is crucial for understanding material properties.

Purpose of the Study:

  • To introduce a novel magic angle spinning (MAS) multiple-quantum spin counting experiment.
  • To enable the study of multiple-quantum excitation dynamics with high time resolution.
  • To apply the new method to measure dipolar-coupled spin cluster sizes in adamantane.

Main Methods:

  • Development of a new MAS multiple-quantum spin counting experiment.

Related Experiment Videos

  • Utilized the C7 recoupling sequence.
  • Experiments conducted on adamantane at fast MAS rates, comparable to the nonspinning dipolar linewidth.

    • Main Results:

    • The novel experiment functions effectively at high MAS rates.
    • Demonstrated the ability to track multiple-quantum excitation dynamics with fine time resolution.
    • Measured spin cluster sizes in adamantane and compared them with results from the nonspinning spin counting technique.

    Conclusions:

    • The new MAS multiple-quantum spin counting experiment offers significant advantages in speed and resolution.
    • It provides a reliable method for determining the sizes of dipolar-coupled spin clusters.
    • This technique advances the capabilities of solid-state NMR for characterizing spin interactions.