Abstract
The dynamics of heteronuclear spin decoupling in solids is treated rigorously in the case of deuterons ($^{2}\mathrm{D}$) decoupled from protons ($^{1}\mathrm{H}$). Dipole-dipole interaction among each spin species is neglected. Deuteron decoupling in the presence of strong quadrupolar interaction ${\ensuremath{\omega}}_{Q}$ is governed by a double-quantum process, which is demonstrated by experiments and by double-quantum-limit calculations as compared with the rigorous treatment. Double-quantum satellites are observed in the proton NMR spectra due to coherent double-quantum motion of the deuteron spins.
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