MONTE-CARLO STUDY OF ISOLATED DEFECT PRODUCTION IN ION-INDUCED COLLISION CASCADES

Monte Carlo simulation is used to study defect production during ion b ombardment. The systems of 300 keV Ni+ --> Ni and 1 MeV H+ --> Ni are studied as representatives of heavy-ion and light-ion bombardment, res pectively. The number of isolated defects-vacancies and interstitials- is determined which have no recombination partner within a distance of one recombination radius r(rec). Our simulations predict a fraction o f freely-migrating defects of 1.5% for 300 keV Ni+ bombardment, and 20 % for 1 MeV H+ bombardment, if a common value of r(rec) congruent-to 1 0 angstrom is employed. This is in good agreement with measured data.