AI Article Synopsis
- Magic angle spinning (MAS) in solid-state NMR helps eliminate broadening caused by chemical shift anisotropy (CSA), but this study explores reintroducing CSA for selective inversion of transverse magnetization.
- The method involves adjusting the radio frequency field's amplitude in relation to the spinning frequency, with selectivity dependent on CSA size.
- A theoretical framework is created to explain the process, validated through numerical simulations and experiments, and combined with cross-polarization (CP) for improved multi-dimensional MAS NMR applications.
Article Abstract
Magic angle spinning (MAS) is used in solid-state NMR to remove the broadening effects of the chemical shift anisotropy (CSA). In this work we investigate a technique that can reintroduce the CSA in order to selectively invert transverse magnetization. The technique involves an amplitude sweep of the radio frequency field through a multiple of the spinning frequency. The selectivity of this inversion mechanism is determined by the size of the CSA. We develop a theoretical framework to describe this process and demonstrate the CSA selective inversion with numerical simulations and experimental data. We combine this approach with cross-polarization (CP) for potential applications in multi-dimensional MAS NMR.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2745485 | PMC |
| http://dx.doi.org/10.1016/j.jmr.2009.07.003 | DOI Listing |
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