Enhancement of the central-transition signal in static and magic-angle-spinning NMR of quadrupolar nuclei by frequency-swept fast amplitude-modulated pulses

被引：27

作者：

Bräuniger, T

Ramaswamy, K

Madhu, PK

机构：

[1] Univ Halle Wittenberg, Dept Phys, NMR Grp, D-06108 Halle Saale, Germany

[2] Washington Univ, McMillen Chem Labs, St Louis, MO 63130 USA

[3] Tata Inst Fundamental Res, Dept Chem Sci, Bombay 400005, Maharashtra, India

来源：

CHEMICAL PHYSICS LETTERS | 2004年 / 383卷 / 3-4期

关键词：

D O I：

10.1016/j.cplett.2003.11.049

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：

We here report on using fast amplitude-modulated (FAM) pulse trains with constantly incremented pulse durations (SW-FAM) for signal enhancement in one-dimensional nuclear magnetic resonance spectra of quadrupolar nuclei with half-integer spin. In such systems, a FAM pulse train leads to a redistribution of populations across the spin levels, which results in a substantial gain for the central-transition signal. Compared to fixed-duration FAM pulse trains, SW-FAM delivers about the same signal enhancement for spinning samples, but gives much better performance in the static case. This is demonstrated for several compounds, observing the nuclei Na-23 (I = 3/2), Al-27 (I = 5/2), and Sc-45 (I = 7/2). (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：403 / 410

页数：8

共 22 条

[1] Efficient 5QMAS NMR of spin-5/2 nuclei:: use of fast amplitude-modulated radio-frequency pulses and cogwheel phase cycling [J].