Determination of thePInantisite structure in InP by optically detected electron-nuclear double resonance

Optically detected electron-nuclear double resonance (ODENDOR) is reported for the ${\mathrm{P}}_{\mathrm{In}}$ antisite in p-type InP. In both electron-irradiated and as-grown samples, ENDOR signals from the four nearest P neighbors and the next In shell were detected by monitoring radio-frequency-induced changes in magnetic circular dichroism associated with absorption near the band edge of InP while maintaining microwave resonance of the ${\mathrm{P}}_{\mathrm{In}}$ antisite. The electronic wave function of the ${\mathrm{P}}_{\mathrm{In}{}^{+}}$ state is highly localized, essentially all of it accounted for within these first two neighbor shells. The optical-absorption band associated with the antisite is centered above the InP band gap, and only its tail is observed.