Abstract
The electron paramagnetic resonance signal of an exchange-coupled pair consisting of a shallow interstitial Li donor and a deep Na-related acceptor has been identified in $\mathrm{ZnO}$ nanocrystals with radii smaller than $1.5\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. From electron nuclear double resonance experiments it is concluded that the deep Na-related acceptor is located at the interface of the $\mathrm{ZnO}$ core and the $\mathrm{Zn}(\mathrm{OH}{)}_{2}$ capping layer, while the Li donor is in the $\mathrm{ZnO}$ core.
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