Optical detection of magnetic resonance is reported for isolated interstitial Zr₁⁺ in ZnSe produced by 2.5-MeV electron irradiation at 4.2 K. It is detected as a reduction of the distant-donor--to--Frenkel-pair recombination luminescence at 625 nm. Resolved hyperfine interaction with the central zinc ion and two shells of Se neighbors reveals a highly localized ``deep'' state for the paramagnetic electron. It is stable only to {~}220 K.
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Rong et al. (1987) studied this question.