Influence of thermal motion upon the lineshape in magic-angle-spinning experiments

Abstract The influence of isotropic thermal motion upon MAS NMR spectra is treated theoretically for (i) dominating inhomogeneous magnetic dipolar interaction and (ii) dominating anisotropic chemical shielding interaction. General formulas are derived which describe quantitatively the influence of thermal motion upon the shape of the central line and of the whole sideband pattern. The results of (i) are compared with those of former studies which are shown to be special cases of the general theory presented here.