Oxygen-17 Hyperfine Interaction of theVFCenter in MgO

Abstract

An ESR study of $v_{\mathrm{F}}$ centers in single crystals of MgO enriched in ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ is reported. The ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ hyperfine tensor components are found to be $\left|{t_{\parallel }}^{17}\right|=104.5\mathrm{}\pm 0.5$ G and $\left|{t_{\perp }}^{17}\right|=14.5\mathrm{}\pm 0.5$ G. From these results and those for $g_{\parallel }$ and $g_{\perp }$, two parameters of the ${\mathrm{O}}^{-}$ ion in MgO are determined: The hyperfine interaction parameter ${\alpha }^{17}$ is found to be 22.8 G and the average of $r^{-3\mathrm{}}$ over the $2p$ orbital is ${<r^{-3\mathrm{}}>}_s=2.75\mathrm{}\times {10}^{25}$ ${\mathrm{cm}}^{-3\mathrm{}}$.