Sensitivity enhancements in MQ-MAS NMR of spin-5/2 nuclei using modulated rf mixing pulses

被引：41

作者：

Vosegaard, T

Massiot, D

Grandinetti, PJ

机构：

[1] CNRS, Ctr Rech Mat Haute Temp, F-45071 Orleans 2, France

[2] Ohio State Univ, Dept Chem, Columbus, OH 43210 USA

来源：

CHEMICAL PHYSICS LETTERS | 2000年 / 326卷 / 5-6期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(00)00779-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

An X-(X) over bar pulse train with stepped modulation frequency was employed to enhance the multiple-quantum to single-quantum coherence transfer in the mixing period of the multiple-quantum magic-angle spinning (MQ-MAS) experiment for spin I = 5/2 nuclei. Two MQ-MAS pulse sequences employing this mixing scheme for the triple-to-single and quintuple-to-single quantum coherence transfers have been designed and their performance is demonstrated for Al-27 on samples of NaSi3AlO8 and 9Al(2)O(3) . 2B(2)O(3). Compared to the standard single-pulse mixing sequences, the sensitivity is approximately doubled in the present experiments. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：454 / 460

页数：7

共 31 条

[11] ISOTROPIC SPECTRA OF HALF-INTEGER QUADRUPOLAR SPINS FROM BIDIMENSIONAL MAGIC-ANGLE-SPINNING NMR [J].