Preprints
https://doi.org/10.5194/mr-2021-43
https://doi.org/10.5194/mr-2021-43

  07 May 2021

07 May 2021

Review status: a revised version of this preprint was accepted for the journal MR and is expected to appear here in due course.

Effects of radial radio-frequency field inhomogeneity on MAS solid-state NMR experiments

Kathrin Aebischer1, Zdeněk Tošner2, and Matthias Ernst1 Kathrin Aebischer et al.
  • 1Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
  • 2Department of Chemistry, Faculty of Science, Charles University, Hlavova 8, 12842 Prague 2, Czech Republic

Abstract. Radio-frequency field inhomogeneity is one of the most common imperfections in NMR experiments. They can lead to imperfect flip angles of applied radio-frequency (rf) pulses or to a mismatch of resonance conditions resulting in artifacts or degraded performance of experiments. In solid-state NMR under magic-angle spinning, the radial component becomes time-dependent because the rf-irradiation amplitude and phase is modulated with integer multiples of the spinning frequency. We analyze the influence of such time-dependent MAS-modulated rf fields on the performance of some commonly used building blocks of solid-state NMR experiments. This analysis is based on analytical Floquet calculations as well as numerical simulations taking into account the time dependence of the rf field. We find that compared to the static part of the rf-field inhomogeneity, such time-dependent modulations play a very minor role in the performance degradation of the investigated typical solid-state NMR experiments.

Kathrin Aebischer et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on mr-2021-43', Malcolm Levitt, 20 May 2021
    • AC1: 'Reply to review report', Matthias Ernst, 24 May 2021
      • RC2: 'Reply on AC1', Malcolm Levitt, 24 May 2021
        • AC2: 'Reply on RC2', Matthias Ernst, 24 May 2021
  • RC3: 'Comment on mr-2021-43', Anonymous Referee #2, 28 May 2021
    • AC3: 'Reply on RC3', Matthias Ernst, 01 Jun 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on mr-2021-43', Malcolm Levitt, 20 May 2021
    • AC1: 'Reply to review report', Matthias Ernst, 24 May 2021
      • RC2: 'Reply on AC1', Malcolm Levitt, 24 May 2021
        • AC2: 'Reply on RC2', Matthias Ernst, 24 May 2021
  • RC3: 'Comment on mr-2021-43', Anonymous Referee #2, 28 May 2021
    • AC3: 'Reply on RC3', Matthias Ernst, 01 Jun 2021

Kathrin Aebischer et al.

Kathrin Aebischer et al.

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Short summary
The radio-frequency (rf) field amplitude in solid-state NMR probes changes over the sample volume, i.e., different parts of the sample will experience different nutation frequencies. If the sample is rotated inside the coil as it is typical for magic-angle spinning in solid-state NMR, such a position-dependent inhomogeneity leads to an additional time dependence of the rf-field amplitude. We show that such time-dependent modulations do not play an important role in many experiments.