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. ISSN 1090-7807

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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
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF MAGNETIC RESONANCE
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
ISSN:	1090-7807
Date:	August 2003
Volume:	163
Number:	2
Number of Pages:	8
Page Range:	pp. 310-317
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9405

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