To what extent does the centerband and each spinning sideband contain contributions from different crystallites of the powder sample?
It is shown that due to the destructive interference of the magnetization paths of crystallites taking place during the rotor period at slow spinning regime, the contribution of different crystallites to the centerband and to each spinning sideband is strongly weighted. For this, a separated-local-field experiment is used to tag the crystallites contributing to a given spinning sideband at different spinning speeds. The orientation dependence of spinning sidebands is also responsible for different lineshapes of the centerband and of each spinning sidebands observed under conditions of off-magic angle spinning.
Laboratoire de Méthodologie RMN, UPRESA CNRS 7042, Université H. Poincaré, Vandoeuvre-lès-Nancy, France. pt@meth-rmn.u-nancy.fr
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D003460:Crystallization; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008280:Magnetics; D008433:Mathematics; D011208:Powders; D011846:Radio Waves; D012680:Sensitivity and Specificity
D011208:Powders