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Radial-field sidebands in MAS.

P Tekely1, M Goldman

  • 1Laboratoire de Méthodologie RMN, UPRESA CNRS 7042, Université H. Poincaré, Nancy I, Vandoeuvre-lès-Nancy, 54506, France.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 3, 2001
PubMed
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Radial-field sidebands in solid-state Nuclear Magnetic Resonance (NMR) magic angle spinning (MAS) spectra are explained. Their intensity is independent of spinning speed and can affect spinning sideband intensities, especially for edge-placed samples.

Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Radiofrequency (RF) field dynamics

Background:

  • Magic Angle Spinning (MAS) is a key technique in solid-state NMR.
  • RF fields are crucial for manipulating nuclear spins but can introduce artifacts.
  • Understanding artifacts like spinning sidebands is vital for accurate spectral interpretation.

Purpose of the Study:

  • To theoretically describe and experimentally demonstrate sidebands arising from the radial RF field component in MAS NMR.
  • To investigate the dependence of these sidebands on spinning speed and sample positioning.

Main Methods:

  • Theoretical modeling of RF field distribution at coil edges.
  • Experimental MAS NMR spectroscopy with varying spinning speeds and sample configurations.

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Main Results:

  • Observed sidebands at +/-v(r) attributed to the radial RF field component.
  • Sideband intensity is independent of sample spinning speed.
  • These sidebands can significantly contribute to the intensity of the -1 spinning sideband, particularly for samples at coil edges or in long rotors.

Conclusions:

  • The radial RF field component is a significant factor influencing MAS NMR spectra.
  • The observed sidebands provide a new understanding of spectral artifacts.
  • Proper consideration of these sidebands is necessary for accurate analysis of MAS NMR data, especially in specific experimental setups.