Cross-relaxation effects in stimulated-echo-type PGSE NMR experiments by bipolar and monopolar gradient pulses
2000 (English)In: Journal of magnetic resonance (San Diego, Calif. 1997: Print), ISSN 1090-7807, E-ISSN 1096-0856, Vol. 146, no 2, 283-289 p.Article in journal (Refereed) Published
Exchange of longitudinal spin polarization by dipolar cross relaxation between nonequivalent spins results in a modulation of the stimulated echo signal on increasing the encoding/decoding delays and in a multiexponential decap on increasing the diffusion time. These artifacts are suppressed by 180 degrees pulses inserted in the middle of the gradient encoding/decoding periods. The efficiency of the gradient encoding is preserved if bipolar gradient pulses are used instead of monopolar pulses. The behavior of the different pulse sequences is demonstrated by F-19 PGSE NMR experiments in a lyotropic liquid crystal in both isotropic micellar and oriented nematic phases.
Place, publisher, year, edition, pages
2000. Vol. 146, no 2, 283-289 p.
cross-relaxation, PGSE NMR, stimulated echo, bipolar gradients, pentadecafluorooctanoate-water-system, studying translational diffusion, nuclear-magnetic-resonance, self-diffusion, chemical-exchange, liquid-crystals, field, spectroscopy, coefficients, phase
IdentifiersURN: urn:nbn:se:kth:diva-20077ISI: 000089711600005OAI: oai:DiVA.org:kth-20077DiVA: diva2:338770
QC 201005252010-08-102010-08-10Bibliographically approved