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.

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收藏

页码：454 / 460

页数：7

相关论文

共 31 条

[1] Z filtering in MQMAS NMR [J].

Amoureux, JP ;

Fernandez, C ;

Steuernagel, S .

JOURNAL OF MAGNETIC RESONANCE SERIES A, 1996, 123 (01) :116-118

[2] Optimized multiple-quantum magic-angle spinning NMR experiments on half-integer quadrupoles [J].

Amoureux, JP ;

Fernandez, C ;

Frydman, L .

CHEMICAL PHYSICS LETTERS, 1996, 259 (3-4) :347-355

[3] SELECTION OF COHERENCE-TRANSFER PATHWAYS IN NMR PULSE EXPERIMENTS [J].

BODENHAUSEN, G ;

KOGLER, H ;

ERNST, RR .

JOURNAL OF MAGNETIC RESONANCE, 1984, 58 (03) :370-388

[4] Two-dimensional multiple-quantum MAS NMR of quadrupolar nuclei: A comparison of methods [J].

Brown, SP ;

Wimperis, S .

JOURNAL OF MAGNETIC RESONANCE, 1997, 128 (01) :42-61

[5] Two-dimensional MAS multiple-quantum NMR of quadrupolar nuclei, removal of inhomogeneous second-order broadening [J].

Brown, SP ;

Heyes, SJ ;

Wimperis, S .

JOURNAL OF MAGNETIC RESONANCE SERIES A, 1996, 119 (02) :280-284

[6] Shaped pulse excitation in multi-quantum magic-angle spinning spectroscopy of half-integer quadrupole spin systems [J].

Ding, SW ;

McDowell, CA .

CHEMICAL PHYSICS LETTERS, 1997, 270 (1-2) :81-86

[7] OFF-RESONANCE NUTATION NUCLEAR-MAGNETIC-RESONANCE STUDY OF FRAMEWORK ALUMINOSILICATE GLASSES WITH LI, NA, K, RB OR CS AS CHARGE-BALANCING CATION [J].

DIRKEN, PJ ;

NACHTEGAAL, GH ;

KENTGENS, APM .

SOLID STATE NUCLEAR MAGNETIC RESONANCE, 1995, 5 (02) :189-200

[8] Further developments in MQMAS NMR spectroscopy for spin-3/2 nuclei [J].

Duer, MJ ;

Stourton, C .

JOURNAL OF MAGNETIC RESONANCE, 1997, 124 (01) :189-199

[9]

DUPREE R, 1985, PHYS CHEM GLASSES, V26, P50

[10] 2D MULTIQUANTUM MAS-NMR SPECTROSCOPY OF AL-27 IN ALUMINOPHOSPHATE MOLECULAR-SIEVES [J].

FERNANDEZ, C ;

AMOUREUX, JP .

CHEMICAL PHYSICS LETTERS, 1995, 242 (4-5) :449-454

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