The effect of structure development in electron-irradiated type la diamond

摘要

A type la diamond crystal with a nitrogenimpurity in different forms was 3.5MeV electron-irradiated withsuccessively increasing doses 5×1016,2×1017,4×1017,2×1018e/cm2 and examined after each dose by positron annihilation,EPR and optical spectroscopy in visible and IR regions. Afterirradication with highest dose a development of the defectivestructure of the crystal was revealed. A detail description of thephenomenon, data of EPR and optical measurements fordifferent irradiation doses are given. The first results ofcathodoluminescence studies of the as-developed structure arepresented. Possible models of defects responsible for main linesin CL spectra are listed.