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Application of amplitude-modulated radiofrequency fields to the magic-angle spinning NMR of spin-7/2 nuclei
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UNSPECIFIED (2003) Application of amplitude-modulated radiofrequency fields to the magic-angle spinning NMR of spin-7/2 nuclei. JOURNAL OF MAGNETIC RESONANCE, 163 (2). pp. 310-317. doi:10.1016/S1090-7807(03)00159-9 ISSN 1090-7807.
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Official URL: http://dx.doi.org/10.1016/S1090-7807(03)00159-9
Abstract
We report pulse sequences for the sensitivity enhancement of magic-angle spinning and multiple-quantum magic-angle spinning spectra of spin-(7)/(2) systems. Sensitivity enhancement is obtained with the use of fast amplitude-modulated (FAM) radiofrequency pulses. In one-dimensional magic-angle spinning experiments, signal enhancement of 3 is obtained by a FAM pulse followed by a soft 90 pulse. In two-dimensional multiple-quantum magic-angle spinning experiments, FAM pulses are used for both the excitation of multiple-quantum coherences and for their conversion into observable single-quantum coherences. The observed signal enhancements are 2.2 in 3Q experiments, 3.1 in 5Q experiments, and 4.1 in 7Q experiments, compared to the conventional two-pulse scheme. The pulse schemes are demonstrated on the Sc-45 NMR of Sc-2(SO4)(3) (.) 5H(2)O and the La-139 NMR of LaAlO3. We also demonstrate the generation of FAM pulses by double-frequency irradiation. (C) 2003 Published by Elsevier Science (USA).
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: | August 2003 | ||||
Dates: |
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Volume: | 163 | ||||
Number: | 2 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 310-317 | ||||
DOI: | 10.1016/S1090-7807(03)00159-9 | ||||
Publication Status: | Published |
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