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RF inhomogeneity and how it controls CPMAS.

Rupal Gupta1, Guangjin Hou1, Tatyana Polenova1

  • 1Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA.

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Summary

Radiofrequency field (RF) inhomogeneity affects cross-polarization (CP) signal intensity in magic-angle spinning (MAS) NMR. A new model quantifies this effect, showing spatial selectivity can overcome inhomogeneity for accurate spectral parameters.

Keywords:
CPMASCross polarizationDipolar recouplingMagic angle spinningRF inhomogeneity

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Area of Science:

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

Background:

  • Cross-polarization (CP) is a crucial technique in solid-state NMR for enhancing sensitivity.
  • Magic-angle spinning (MAS) is employed to achieve high resolution in solid-state NMR.
  • Radiofrequency (RF) field inhomogeneity can significantly impact the efficiency and accuracy of CP-MAS experiments.

Purpose of the Study:

  • To investigate the impact of radiofrequency (RF) field inhomogeneity on cross-polarization (CP) signal intensity under magic-angle spinning (MAS).
  • To develop and validate a model for quantifying position-dependent RF amplitude profiles.
  • To assess the implications of RF inhomogeneity for quantitative measurements in CP-MAS experiments.

Main Methods:

  • Analysis of CP-detected signal intensity as a function of sample position.
  • Introduction of a power-function model to describe the RF-amplitude profile.
  • Experimental verification using nutation spectra from direct detection and CPMAS detection in commercial MAS probes with varying RF inhomogeneity.

Main Results:

  • A power-function model effectively quantifies the position-dependent RF-amplitude profile.
  • Experimental data confirm the model's applicability across different MAS probes.
  • Significant portions of the sample rotor may not contribute to the detected spectra due to RF inhomogeneity.

Conclusions:

  • RF inhomogeneity leads to spatial variations in CP signal intensity, with substantial parts of the sample potentially not contributing.
  • Spatial selectivity of the Hartmann-Hahn matching condition can mitigate the negative effects of RF inhomogeneity.
  • Accurate spectral parameters can still be determined in CP-MAS experiments, even with high RF inhomogeneity, by leveraging spatial selectivity.