Abstract
A new defect in additively colored calcium oxide is studied by means of optically detected magnetic resonance and spin-coherence experiments. It is established that the defect shows emission from a spin-quartet state with spin-Hamiltonian parameters $|D|=1950\ifmmode\pm\else\textpm\fi{}2$ MHz, $|E|=550\ifmmode\pm\else\textpm\fi{}2$ MHz, and $g=2.00\ifmmode\pm\else\textpm\fi{}0.05$. The fine-structure principal axes are along [110], [110], and [001]. We argue the existence of a vacancy-interstitial hole, the $F$ center-${\mathrm{O}}_{2}^{\ensuremath{-}}$ pair, that can be photoexcited in the phosphorescent quartet state. Time-resolved microwave recovery experiments at zero field yielded the lifetimes of the radiative and nonradiative quartet sublevels to be 230 \ensuremath{\mu}s and 3.8 ms, respectively. From optically detected spin-coherence decay measurements at 1.4 K a phase memory time of 38 \ensuremath{\mu}s was found, showing that irreversible spin dephasing is not determined by population relaxation.
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