Abstract
Rapid rotation of an assembly of dipolar coupled nuclei has a profound effect on the nuclear magnetic resonance absorption spectrum. In turn, this affects the broadening caused by random fields even when the correlation frequency greatly exceeds the rotation rate. This broadening is considered for a rotating pair of I = ½ nuclei and it is concluded that rotation may reduce the broadening due to very rapidly fluctuating fields. In this case the broadening depends on the degree of overlap of the frequency spectra of off-diagonal elements of the density matrix. When the angle between the rotation axis and the external magnetic field is 54.7° a continuous transition from almost no overlap to complete coincidence is obtained with rising rotation speed. For slowly varying fields, on the other hand, broadening may be increased by rotation.
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