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Modulation-aided signal enhancement in the magic angle spinning NMR of spin-5/2 nuclei
Affiliation:1. Department of Chemistry, University of Southampton, Southampton SO17 1BJ, UK;2. Department of Physics, University of Warwick, Coventry CV4 7AL, UK;1. Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calgary, Alberta T2N 1N4, Canada;2. Natural Resources Canada, CanmetENERGY, 1 Oil Patch Drive, Suite A202, Devon, Alberta T9G 1A8, Canada;3. National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada;1. Instituto Superior de Tecnologías y Ciencias Aplicadas (InSTEC), Universidad de La Habana, Ave. Salvador Allende No. 1110, Quinta de los Molinos, La Habana 10400, Cuba;2. Instituto de Física Fundamental, CSIC, Serrano 123, 28006 Madrid, Spain;3. Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense de Madrid (Unidad Asociada I+D+i CSIC), 28040 Madrid, Spain;1. V.E. Zuev Institute of Atmospheric Optics SB RAS, Academician Zuev Square 1, Tomsk 634021, Russia;2. National Research Tomsk State University, Lenina Av. 36, Tomsk 634050, Russia;1. Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Republic of Korea;2. Department of Chemistry and Department of Biophysics and Chemical Biology, Seoul National University, Seoul 151-747, Republic of Korea
Abstract:We report signal enhancement schemes using fast amplitude modulated pulses for the one-dimensional (1D) nuclear magnetic resonance (NMR) of spin-5/2 nuclei under magic-angle spinning. Signal enhancement by a factor of around 2.5 is observed when amplitude modulated pulses precede selective excitation of the central transition. This enhancement is a result of the redistribution of energy level populations through partial saturation of the satellite transitions. Results are shown for 27Al and 17O. The gain in signal intensity is very useful for the observation of weak signals from low abundance quadrupolar nuclei. The scheme works for wide ranges of quadrupole interactions and rf powers.
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