dorsal/arxiv
View SchemaComposite Dipolar Recoupling: Anisotropy Compensated Coherence Transfer in Solid-State NMR
| Authors | N. Khaneja, C. Kehlet, S. J. Glaser, N. C. Nielsen |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0601022 |
| URL | https://arxiv.org/abs/quant-ph/0601022 |
| DOI | 10.1063/1.2179431 |
Abstract
The efficiency of dipole-dipole coupling driven coherence transfer experiments in solid-state 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 experiment.
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"abstract": "The efficiency of dipole-dipole coupling driven coherence transfer\nexperiments in solid-state NMR spectroscopy of powder samples is limited by\ndispersion of the orientation of the internuclear vectors relative to the\nexternal magnetic field. Here we introduce general design principles and\nresulting pulse sequences that approach full polarization transfer efficiency\nfor all crystallite orientations in a powder in magic-angle-spinning\nexperiments. The methods compensate for the defocusing of coherence due to\norientation dependent dipolar coupling interactions and inhomogeneous\nradio-frequency fields. The compensation scheme is very simple to implement as\na scaffold (comb) of compensating pulses in which the pulse sequence to be\nimproved may be inserted. The degree of compensation can be adjusted and should\nbe balanced as a compromise between efficiency and length of the overall pulse\nsequence. We show by numerical and experimental data that the presented\ncompensation protocol significantly improves the efficiency of known dipolar\nrecoupling solid-state NMR experiment.",
"arxiv_id": "quant-ph/0601022",
"authors": [
"N. Khaneja",
"C. Kehlet",
"S. J. Glaser",
"N. C. Nielsen"
],
"categories": [
"quant-ph"
],
"doi": "10.1063/1.2179431",
"title": "Composite Dipolar Recoupling: Anisotropy Compensated Coherence Transfer in Solid-State NMR",
"url": "https://arxiv.org/abs/quant-ph/0601022"
},
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