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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.ORCID iD: 0000-0001-9409-2601
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
2009 (English)In: Journal of Magnetic Resonance, Vol. 200, no 2, p. 267-279Article 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, p. 267-279
Keywords [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, id: diva2:286497
Available from: 2010-01-14 Created: 2010-01-08 Last updated: 2019-12-03Bibliographically approved

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