Abstract
Measurements have been made of the quadrupole couplings of $^{12}\mathrm{N}$ implanted in single crystals of Be and Mg and of $^{12}\mathrm{B}$ implanted in a single crystal of Zn. A comparison of the $^{12}\mathrm{N}$ couplings in Be and Mg suggests that (i) the final stopping sites of the implanted $^{12}\mathrm{N}$ ions are substitutional sites, i.e., the $^{12}\mathrm{N}$ ions occupy metal-ion lattice positions, and (ii) the $^{12}\mathrm{N}$ ions implanted in Be and Mg have the same charge state and quadrupole shielding factor. A procedure is outlined for deducing $Q(^{12}\mathrm{N})$. The $^{12}\mathrm{B}$ couplings in Zn imply the existence of two inequivalent stopping sites. The problems encountered in deducing $Q(^{12}\mathrm{B})$ from couplings in metal hexagonal crystals are discussed.
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