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Improved Convection Compensating Pulsed Field Gradient Spin-Echo and Stimulated-Echo Methods

✍ Scribed by Geir Humborstad Sørland; John Georg Seland; Jostein Krane; Henrik W Anthonsen

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
57 KB
Volume
142
Category
Article
ISSN
1090-7807

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✦ Synopsis

When performing measurements at elevated temperature, small convection currents may give rise to erroneous values of the diffusion coefficient. In work with high resolution NMR spectroscopy, the application of magnetic field gradients also introduces an eddy-current magnetic field which may result in errors in phase and baseline in the FFT-spectra. The eddy current field has been greatly suppressed by the application of bipolar magnetic field gradients. However, when introducing bipolar magnetic field gradients, the pulse sequence is lengthened significantly. This has recently been pointed out as a major drawback because of the loss of coherence and of NMR-signal due to transverse relaxation processes. Here we present modified convection compensating pulsed field gradient double spin echo and double stimulated echo sequences which suppress the eddy-current magnetic field without increasing the duration of the pulse sequences.

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