Login / Signup

Echo Pulses for Background Suppression by Optimal Control.

Hector Javier Cortes SanchezJörn Schmedt Auf der Günne
Published in: Magnetic resonance in chemistry : MRC (2023)
Materials used to construct magic-angle-spinning NMR probes can contain NMR active nuclei that produce a significant amount of background signal. Because these materials are located outside the sample coil, the use of spatially selective pulses to remove the background is a popular approach for background suppression. However, previously suggested spatially selective pulses suffer from limited excitation bandwidths which may make them unsuitable for the acquisition of nuclei with a large chemical shift range. Here a pulse (OC-BACK) is presented which has been developed by optimal control, which has a flat profile of ~120 kHz with respect to off-resonance effects and extended pass and suppression bands with respect to the nominal nutation frequency. The presented solution is large enough to be effective for background suppression schemes in 19 F magic-angle-spinning NMR at medium and low magnetic fields.
Keyphrases
  • solid state
  • high resolution
  • magnetic resonance
  • blood pressure
  • high frequency
  • small molecule
  • computed tomography
  • mass spectrometry
  • molecularly imprinted
  • quantum dots
  • contrast enhanced