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Frequency offset refocused PISEMA-type sequences
2005 (English)In: Journal of magnetic resonance, ISSN 1090-7807, E-ISSN 1096-0856, Vol. 175, no 1, 163-169 p.Article in journal (Refereed) Published
Abstract [en]

The popular PISEMA experiment is highly sensitive to the H-1 chemical shift dispersion and the choice of the H-1 carrier frequency. This is due to the off-resonance H-1 irradiation in the FSLG-CP sequence employed during the dipolar evolution period. In the modified approach described in this work, the interfering frequency offset terms are suppressed. In the new pulse schemes, conventional FSLG-CP is intercalated with 180 degrees pulses applied Simultaneously to both frequency channels, and with phases set orthogonal to those of the spin-lock fields. The technique is demonstrated on a nematic liquid-crystalline sample. Extensions to amplitude-modulated FSLG-CP recoupling under MAS are also presented.

Place, publisher, year, edition, pages
2005. Vol. 175, no 1, 163-169 p.
Keyword [en]
separated local field spectroscopy, dipolar couplings, MAS, PISEMA, cross-polarization, state nmr-spectroscopy, heteronuclear dipolar couplings, local-field spectroscopy, inversion spin-exchange, magic-angle, cross-polarization, liquid-crystals, solids, dynamics, columnar
Identifiers
URN: urn:nbn:se:kth:diva-14854DOI: 10.1016/j.jmr.2005.03.016ISI: 000230050200016OAI: oai:DiVA.org:kth-14854DiVA: diva2:332895
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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Dvinskikh, Sergey V.

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