Composite pulses for efficient excitation of half-integer quadrupolar nuclei in NMR of static and spinning solid samples

Carnevale, DiegoBodenhausen, Geoffrey2012-04-052012-04-052012-04-05201210.1016/j.cplett.2012.01.058https://infoscience.epfl.ch/handle/20.500.14299/79222WOS:000301180700022Composite pulses of the type (tau(p))(x)(2 tau(p))(-x)(3 tau(p))(x) allow one to excite the central transition of nuclei with half-integer spin with enhanced efficiency compared to a simple (tau(sp)(p))(x) pulse. The method has been tested on solid samples containing sodium-23 (I = 3/2), aluminium-27 (I = 5/2) and scandium-45 (I = 7/2) under both static and magic-angle spinning conditions. Numerical simulations for I = 3/2 indicate that the enhancement is due to a more efficient conversion of Zeeman population differences associated with the satellite transitions to the central transition. (C) 2012 Elsevier B. V. All rights reserved.Hyperbolic Secant PulsesQuantum Cross-PolarizationDouble Frequency SweepsSensitivity EnhancementCentral-TransitionMqmas NmrPopulation TransfersAmplitude-ModulationMagnetic-ResonanceSignal EnhancementComposite pulses for efficient excitation of half-integer quadrupolar nuclei in NMR of static and spinning solid samplestext::journal::journal article::research article