BETA-NMR ON IMPLANTED BORON AND NITROGEN IN ZNSE

Spin-polarized radioactive B-12 and N-12 probe nuclei are produced in nuclear reactions and implanted into nominally undoped ZnSe at station ary concentrations less than or similar to 10(8) cm(-3). The implanted impurities are characterized by beta-radiation detected nuclear magne tic resonance (beta-NMR) measurements within similar to 20 ms after th e implantation event. About 85% of the implanted B occupy substitution al Zn-sites after moderate annealing and are immobile there up to at l east 950 K. Our first data on N implantation show a substantial fracti on reaching cubic lattice sites, essentially without any annealing. We tentatively assign this fraction to unperturbed N-Se(-) (C) 1998 Else vier Science B.V. All rights reserved.