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Efficient 5QMAS NMR of spin-5/2 nuclei: use of fast amplitude-modulated radio-frequency pulses and cogwheel phase cycling
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UNSPECIFIED (2003) Efficient 5QMAS NMR of spin-5/2 nuclei: use of fast amplitude-modulated radio-frequency pulses and cogwheel phase cycling. JOURNAL OF MAGNETIC RESONANCE, 163 (1). pp. 64-72. doi:10.1016/S1090-7807(03)00124-1 ISSN 1090-7807.
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Official URL: http://dx.doi.org/10.1016/S1090-7807(03)00124-1
Abstract
We report here an efficient multiple-quantum magic-angle spinning (MQMAS) pulse sequence involving fast amplitude-modulated (FAM) radio-frequency pulses for excitation and conversion of five-quantum (5Q) coherences of spin-5/2 nuclei. The use of a FAM-I type pulse train for the conversion of 5Q into IQ coherences proves to be easier to implement experimentally than the earlier suggested use of a FAM-II type sequence [J. Magn. Reson. 154 (2002) 280], while delivering at least equal signal enhancement. Results of numerical simulations and experimental Al-27 5QMAS spectra of aluminium acetylacetonate for different excitation and conversion schemes are compared to substantiate these claims. We also demonstrate the feasibility of acquiring 5QMAS spectra of spin-5/2 systems using cogwheel phase cycling [J. Magn. Reson. 155 (2002) 300] to select the desired coherence pathways. A cogwheel phase cycle of only 57 steps is shown to be as effective as the minimum conventional nested 77-step phase cycle. (C) 2003 Elsevier Science (USA). All rights reserved.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
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Journal or Publication Title: | JOURNAL OF MAGNETIC RESONANCE | ||||
Publisher: | ACADEMIC PRESS INC ELSEVIER SCIENCE | ||||
ISSN: | 1090-7807 | ||||
Official Date: | July 2003 | ||||
Dates: |
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Volume: | 163 | ||||
Number: | 1 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 64-72 | ||||
DOI: | 10.1016/S1090-7807(03)00124-1 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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