NMR on OrientedI131Nuclei Implanted in Single-Crystal Iron: Observation of Vacancy-Associated Impurity Sites

Nuclear magnetic resonance was performed on oriented ${}_{}{}^{131}{}_{}{}^{}\mathrm{I}$ nuclei implated in singlecrystal iron. Apart from the substitutional resonance, satellite resonances were found whose number and position depended on the angle between the magnetic field and the crystal axes. These lines are found to originate from impurity sites that have a neighbor vacancy, creating an electric field gradient of 1.05×${10}^{22}$ ${\mathrm{V}/\mathrm{m}}^2$ along one of the $〈111〉$ axes.