Efficient triple-quantum excitation in modified RIACT MQMAS NMR for I=3/2 nuclei

TitleEfficient triple-quantum excitation in modified RIACT MQMAS NMR for I=3/2 nuclei
Publication TypeJournal Article
Year of Publication2002
AuthorsLim K.H, Charpentier T., Pines A
JournalJournal of Magnetic Resonance
Volume154
Issue2
Pagination196-204
Date PublishedFeb
ISBN Number1090-7807
Accession NumberWOS:000174189300005
Keywordscoherence
Abstract

A new approach involving the creation of triple-quantum (TQ) coherences from both TQ and central transitions (CT) is investigated, in order to enhance the efficiency of triple-quantum excitation for I = 3/2 nuclei. The RIACT excitation scheme, a soft pi/2 and hard spin-locking pulse, is shown to induce both adiabatic coherence transfer between CT and TQ coherences and TQ nutation. By combining the RIACT scheme with the presaturation of the satellite transitions, a significant improvement in the TQ excitation can be achieved mainly through enhanced CT polarization via the RIACT mechanism, in particular for nuclei with moderate to large quadrupole coupling constants (greater than or equal to2.0 MHz). There also exists a nontrivial contribution from the TQ transition, which depends on the size of the quadrupole interaction. (C) 2002 Elsevier Science (USA).

URL<Go to ISI>://WOS:000174189300005
DOI10.1006/Jmre.2001.2471
Short TitleEfficient triple-quantum excitation in modified RIACT MQMAS NMR for I=3/2 nuclei
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