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Related Experiment Videos

Novel methods for characterizing a decoupler channel using "undetectable" quantum coherences.

M R Bendall1, T E Skinner

  • 1The Russell Grimwade School of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria, 3052, Australia.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 2, 1999
PubMed
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New 90J pulses selectively transfer coherence in J-coupled spin systems. This enables rapid characterization of RF performance, including frequency calibration and B1 homogeneity mapping.

Area of Science:

  • Magnetic Resonance Spectroscopy
  • Quantum Coherence Transfer

Background:

  • Continuous wave (CW) decoupling in J-coupled spin systems is affected by RF field strength and homogeneity.
  • Antiphase and multiple quantum coherences can be enhanced or generated from decoupled spins.

Purpose of the Study:

  • To investigate the effect of time-independent RF pulses on IS J-coupled systems.
  • To introduce novel pulse sequences for characterizing RF performance in NMR.

Main Methods:

  • Derivation of exact solutions for RF pulse effects on IS J-coupled systems.
  • Development and utilization of "90J pulses" for selective coherence transfer.
  • Implementation of Characterization-of-Decoupler (COD) pulse sequences.

Main Results:

Related Experiment Videos

  • On-resonance CW decoupling signals depend on RF field strength and homogeneity.
  • "Undetectable" coherences can be enhanced or generated, mimicking decoupled signals.
  • 90J pulses enable rapid (minutes) characterization of RF performance: frequency calibration (0.1 Hz accuracy), RF amplitude measurement (500-fold range), and RF homogeneity mapping.

Conclusions:

  • 90J pulses offer a powerful tool for selective spectroscopy.
  • COD sequences utilizing 90J pulses significantly improve the efficiency of RF performance characterization.
  • These methods have potential for general application in selective NMR spectroscopy.