Pure absorption-mode spectra using a modulated RF mixing period in MQMAS experiments.
J Magn Reson
; 143(1): 217-22, 2000 Mar.
Article
em En
| MEDLINE
| ID: mdl-10698663
ABSTRACT
Different approaches to obtain pure absorption-mode lineshapes in MQMAS experiments employing a train of 180 degrees phase-alternating pulses for the multiple-quantum to single-quantum mixing period are investigated. Four pulse sequences, which achieve this by using either the shifted-echo approach or the hypercomplex approach with symmetric coherence transfer pathways, are presented and their improved lineshape- and sensitivity-performance is experimentally demonstrated by (87)Rb MQMAS of RbNO(3). Compared to the original modulated-rf mixing sequence, sensitivity enhancements by factors up to 1.3 are obtained with the sequences described here.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Espectroscopia de Ressonância Magnética
Idioma:
En
Ano de publicação:
2000
Tipo de documento:
Article