Signal enhancement in 5QMAS spectra of spin-5/2 quadrupolar nuclei |
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Authors: | Goldbourt Amir Vega Shimon |
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Institution: | Weizmann Institute of Science, Rehovot, 76100, Israel. amir.goldbourt@weizmann.ac.il |
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Abstract: | 5QMAS experiments on spin-5/2 systems display a low sensitivity compared with their 3QMAS counterparts. Nevertheless, the superior resolution of 5QMAS over 3QMAS makes these experiments a favorable choice for many materials. We report an enhancement scheme for the 5QMAS experiment, using an improved five-quantum excitation pulse scheme combined with a FAM-II conversion pulse. The results are verified experimentally on a polycrystalline sample of gamma-(27)Al(2)O(3), showing an enhancement factor of 2.4 over the simple two-pulse (CW) 5QMAS scheme. Numerical computations of the efficiency parameter epsilon support these results. |
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Keywords: | Abbreviations: solid state NMRAbbreviations: MQMASAbbreviations: FAMAbbreviations: quadrupolar nucleiAbbreviations: sensitivity enhancement |
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