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Cross-relaxation effects in stimulated-echo-type PGSE NMR experiments by bipolar and monopolar gradient pulses
KTH, Tidigare Institutioner                               , Kemi.ORCID-id: 0000-0002-6524-1441
KTH, Tidigare Institutioner                               , Kemi.ORCID-id: 0000-0002-0231-3970
2000 (Engelska)Ingår i: Journal of magnetic resonance, ISSN 1090-7807, E-ISSN 1096-0856, Vol. 146, nr 2, s. 283-289Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
2000. Vol. 146, nr 2, s. 283-289
Nyckelord [en]
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
Identifikatorer
URN: urn:nbn:se:kth:diva-20077ISI: 000089711600005OAI: oai:DiVA.org:kth-20077DiVA, id: diva2:338770
Anmärkning
QC 20100525Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Dvinskikh, Sergey V.Furo, Istvan

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