Supercycled symmetry-based double-quantum dipolar recoupling of quadrupolar spins in MAS NMR
2009 (English)In: Journal of Magnetic Resonance, Vol. 200, no 2, 267-279 p.Article in journal (Refereed) Published
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.
Double-quantum coherence, Half-integer spin quadrupolar nuclei, Average Hamiltonian theory, AHT, Magic-angle spinning, Symmetry-based pulse sequences, Low-power recoupling
IdentifiersURN: urn:nbn:se:su:diva-34433DOI: 10.1016/j.jmr.2009.07.007ISI: 000272260900013OAI: oai:DiVA.org:su-34433DiVA: diva2:286497