Enhanced conversion of triple to single-quantum coherence in the triple-quantum MAS NMR spectrosocopy of spin-5/2 nuclei

Citation
A. Goldbourt et al., Enhanced conversion of triple to single-quantum coherence in the triple-quantum MAS NMR spectrosocopy of spin-5/2 nuclei, CHEM P LETT, 320(5-6), 2000, pp. 448-456
Citations number
20
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS LETTERS
ISSN journal
00092614 → ACNP
Volume
320
Issue
5-6
Year of publication
2000
Pages
448 - 456
Database
ISI
SICI code
0009-2614(20000414)320:5-6<448:ECOTTS>2.0.ZU;2-Q
Abstract
A new type of fast amplitude modulated pulse scheme is presented here that yields a significant sensitivity enhancement in the triple-quantum magic an gle spinning NMR spectrum of a spin-5/2 nucleus. Enhancement is achieved by fast phase alternation of the triple to single-quantum conversion pulse, w hich transfers triple to single-quantum coherence in a direct, non-adiabati c manner. The success of this pulse relies on the difference between the qu adrupolar frequency and the intensity of the rf irradiation field, during i ts short segments. Numerical optimizations and experimental results are pre sented showing the improved performance. (C) 2000 Elsevier Science B.V. All rights reserved.