1 H line width dependence on MAS speed in solid state NMR - Comparison of experiment and simulation

Recent developments in magic angle spinning (MAS) technology permit spinning frequencies of ≥100 kHz. We examine the effect of such fast MAS rates upon nuclear magnetic resonance proton line widths in the multi-spin system of β-Asp-Ala crystal. We perform powder pattern simulations employing Fokker-...

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Published in:Journal of magnetic resonance (1997) 2018-06, Vol.291, p.32
Main Authors: Sternberg, Ulrich, Witter, Raiker, Kuprov, Ilya, Lamley, Jonathan M, Oss, Andres, Lewandowski, Józef R, Samoson, Ago
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container_title Journal of magnetic resonance (1997)
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creator Sternberg, Ulrich
Witter, Raiker
Kuprov, Ilya
Lamley, Jonathan M
Oss, Andres
Lewandowski, Józef R
Samoson, Ago
description Recent developments in magic angle spinning (MAS) technology permit spinning frequencies of ≥100 kHz. We examine the effect of such fast MAS rates upon nuclear magnetic resonance proton line widths in the multi-spin system of β-Asp-Ala crystal. We perform powder pattern simulations employing Fokker-Plank approach with periodic boundary conditions and H-chemical shift tensors calculated using the bond polarization theory. The theoretical predictions mirror well the experimental results. Both approaches demonstrate that homogeneous broadening has a linear-quadratic dependency on the inverse of the MAS spinning frequency and that, at the faster end of the spinning frequencies, the residual spectral line broadening becomes dominated by chemical shift distributions and susceptibility effects even for crystalline systems.
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title 1 H line width dependence on MAS speed in solid state NMR - Comparison of experiment and simulation
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