Abstract
We report on 13C spin–lattice (R1) and spin–spin (R2) relaxation rate dependence on magic-angle-spinning (MAS) rate in highly purified synthetic nanodiamonds. Noticeable slowdown of both relaxation processes and reduction of nuclear spin diffusion coefficient D with increasing MAS rate was obtained. This effect is attributed to suppression of nuclear spin diffusion by MAS. We developed a theoretical approach that describes the MAS rate dependence of R1, R2 and D, allows quantitative analysis of the data and shows good compliance with the experiment.
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