Composite dipolar recoupling: Anisotropy compensated coherence transfer in solid-state nuclear magnetic resonance

被引:20
|
作者
Khaneja, N [1 ]
Kehlet, C
Glaser, SJ
Nielsen, NC
机构
[1] Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA
[2] Aarhus Univ, Interdisciplinary Nanosci Ctr, Ctr Insoluble Prot Struct, DK-8000 Aarhus C, Denmark
[3] Aarhus Univ, Dept Chem, DK-8000 Aarhus C, Denmark
[4] Tech Univ Munich, Dept Chem, D-85747 Garching, Germany
来源
JOURNAL OF CHEMICAL PHYSICS | 2006年 / 124卷 / 11期
关键词
D O I
10.1063/1.2179431
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 efficiency of dipole-dipole coupling driven coherence transfer experiments in solid-state nuclear magnetic resonance (NMR) spectroscopy of powder samples is limited by dispersion of the orientation of the internuclear vectors relative to the external magnetic field. Here we introduce general design principles and resulting pulse sequences that approach full polarization transfer efficiency for all crystallite orientations in a powder in magic-angle-spinning experiments. The methods compensate for the defocusing of coherence due to orientation dependent dipolar coupling interactions and inhomogeneous radio-frequency fields. The compensation scheme is very simple to implement as a scaffold (comb) of compensating pulses in which the pulse sequence to be improved may be inserted. The degree of compensation can be adjusted and should be balanced as a compromise between efficiency and length of the overall pulse sequence. We show by numerical and experimental data that the presented compensation protocol significantly improves the efficiency of known dipolar recoupling solid-state NMR experiments.
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页数:7
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