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Supercycled symmetry-based double-quantum dipolar recoupling of quadrupolar spins in MAS NMR
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
2009 (English)In: Journal of Magnetic Resonance, Vol. 200, no 2, 267-279 p.Article in journal (Refereed) Published
Abstract [en]

Using average Hamiltonian (AH) theory, we analyze recently introduced homonuclear dipolar recoupling pulse sequences for exciting central-transition double-quantum coherences (2QC) between half-integer spin quadrupolar nuclei undergoing magic-angle-spinning. Several previously observed differences among the recoupling schemes concerning their compensation to resonance offsets and radio-frequency (rf) inhomogeneity may qualitatively be rationalized by an AH analysis up to third perturbation order, despite its omission of first-order quadrupolar interactions. General aspects of the engineering of 2Q-recoupling pulse sequences applicable to half-integer spins are discussed, emphasizing the improvements offered from a diversity of supercycles providing enhanced suppression of undesirable AH cross-terms between resonance offsets and rf amplitude errors.

Place, publisher, year, edition, pages
2009. Vol. 200, no 2, 267-279 p.
Keyword [en]
Double-quantum coherence, Half-integer spin quadrupolar nuclei, Average Hamiltonian theory, AHT, Magic-angle spinning, Symmetry-based pulse sequences, Low-power recoupling
Identifiers
URN: urn:nbn:se:su:diva-34433DOI: 10.1016/j.jmr.2009.07.007ISI: 000272260900013OAI: oai:DiVA.org:su-34433DiVA: diva2:286497
Available from: 2010-01-14 Created: 2010-01-08 Last updated: 2011-07-05Bibliographically approved

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