EPR Observation of Close Frenkel Pairs in Irradiated ZnSe

Abstract

Four distinct EPR spectra observed in ZnSe irradiated by 1.5-MeV electrons at 20.4°K are identified as simple zinc-vacancy, zinc-interstitial close pairs of different microscopic configuration. Correlation of defect alignment with incident-electron-beam direction confirms the identification. Isolated zinc vacancies are also produced but with zero initial production rate, suggesting that their production is a two-step process, the first being the formation of close pairs.