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Echo pulses for background suppression by optimal control.

Hector Javier Cortes Sanchez1, Jörn Schmedt Auf der Günne1

  • 1Faculty IV: School of Science and Technology, Department of Chemistry and Biology, Inorganic materials chemistry and Center of Micro- and Nanochemistry and Engineering (Cμ), University of Siegen, Siegen, Germany.

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|May 5, 2023
PubMed
Summary
This summary is machine-generated.

A new optimal control pulse (OC-BACK) effectively suppresses background signals in magic-angle-spinning NMR spectroscopy. This technique enhances data quality for fluorine-19 NMR at lower magnetic fields.

Keywords:
19FNMRbackground suppressionoptimal controlspatially selective pulse

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Materials Science

Background:

  • Magic-angle-spinning (MAS) NMR probes utilize materials with NMR-active nuclei, generating significant background signals.
  • Spatially selective pulses are commonly used for background suppression but often have limited excitation bandwidths.

Purpose of the Study:

  • To develop an improved spatially selective pulse for effective background suppression in MAS NMR.
  • To address the limitations of existing pulses for nuclei with wide chemical shift ranges.

Main Methods:

  • Development of a novel pulse sequence using optimal control (OC-BACK).
  • Characterization of the pulse's performance regarding excitation bandwidth and off-resonance effects.

Main Results:

  • The OC-BACK pulse exhibits a flat profile of approximately 120 kHz for off-resonance effects.
  • It offers extended pass and suppression bands relative to the nominal nutation frequency.

Conclusions:

  • The OC-BACK pulse is suitable for background suppression in fluorine-19 MAS NMR.
  • This method is effective at medium and low magnetic fields, improving spectral quality.