Rotary resonance in multiple-quantum magic-angle spinning

被引：14

作者：

Gan, ZH ^{[1
]}

Grandinetti, P

机构：

[1] Natl High Magnet Field Lab, Ctr Interdisciplinary Magnet Resonance, Tallahassee, FL 32310 USA

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

来源：

CHEMICAL PHYSICS LETTERS | 2002年 / 352卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(01)01428-2

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：

The theory of rotary resonance in multiple-quantum magic-angle spinning (MQMAS) experiment is presented. The rotary resonance effect can enhance the efficiency of MQMAS experiment for high-resolution NMR spectra of half-integer quadrupolar nuclei [J. Chem. Phys. 114 (2001) 4618]. Using a spin-1/2 formalism and Floquet theorem, the spin dynamics of a spin-3/2 under rf irradiation and magic-angle sample spinning is solved analytically in a doubly rotating frame. The results show an oscillatory behavior of MQ excitation with nulls at omega(1) = nomega(r)/2, where omega(1) represents the rf field strength and omega(r) is the spinning frequency. Efficient MQ excitation occurs between these nulls and MQ conversion peaks at omega(1) = nomega(r). The origin of the rotary resonance phenomenon is related to frequency shift of a general two-level system under a randomly modulated periodic perturbation. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：252 / 261

页数：10

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