Abstract
In contrast to conventional NMR techniques that use magnetic field gradients(MFG's) to detect the diffusion of moving atoms, we have developed a highlysensitive approach for detecting electric field gradient (EFG) fluctuationsseen by stationary atoms. These EFG fluctuations were observed in the quadrupoleperturbed NMR behavior of a stationary nucleus ${(}^{93}$Nb)in the incommensurate insulator barium sodium niobate and are attributed tomotion of the modulation wave. We observed effective diffusion constants oforder ${10}^{\ensuremath{-}13}\phantom{\rule{0ex}{0ex}}{\mathrm{cm}}^{2}/\mathrm{s}$, which are 4 orders of magnitude smaller than those currently detectable with MFG NMR.
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