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Related Experiment Videos

Improved convection compensating pulsed field gradient spin-echo and stimulated-echo methods.

G H Sørland1, J G Seland, J Krane

  • 1Department of Chemistry, Norwegian University of Science and Technology, Trondheim, N-7491, Norway.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 29, 2000
PubMed
Summary

This study introduces new nuclear magnetic resonance (NMR) methods to accurately measure diffusion coefficients by compensating for convection currents and suppressing eddy-current magnetic fields without lengthening pulse sequences.

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Area of Science:

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

Background:

  • Convection currents can cause errors in diffusion coefficient measurements, especially at elevated temperatures.
  • Eddy-current magnetic fields in NMR spectroscopy can lead to phase and baseline errors in spectra.
  • Existing convection compensating methods and bipolar magnetic field gradients can lengthen pulse sequences, causing signal loss.

Purpose of the Study:

  • To develop novel convection compensating methods for NMR.
  • To suppress eddy-current magnetic fields without increasing pulse sequence duration.
  • To improve the accuracy of diffusion coefficient measurements in NMR.

Main Methods:

  • Modified convection compensating pulsed field gradient double spin echo sequences.

Related Experiment Videos

  • Modified convection compensating pulsed field gradient double stimulated echo sequences.
  • Implementation of techniques to suppress eddy-current magnetic fields.

    • Main Results:

    • Successfully suppressed eddy-current magnetic fields.
    • Achieved convection compensation without extending pulse sequence length.
    • Maintained signal integrity by avoiding prolonged transverse relaxation.

    Conclusions:

    • The developed NMR sequences effectively compensate for convection currents.
    • The methods mitigate eddy-current magnetic field effects, enhancing spectral quality.
    • These advancements enable more accurate diffusion measurements in NMR spectroscopy.