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

Composite 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.


Published in:
Chemical Physics Letters, 530, 120-125
Year:
2012
Publisher:
Elsevier
ISSN:
0009-2614
Keywords:
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 Record created 2012-04-05, last modified 2018-03-17

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