Characterization of Ion Implanted Deuterium Traps in Nickel by Equilibration with Deuterium Gas

摘要

Deuterium traps produced in nickel by ion implantation of helium have been characterized using a new experimental approach in which the deuterium is introduced by equilibration with deuterium gas. A differentially pumped target chamber allows the amount of trapped deuterium to be monitored by nuclear reaction analysis during the equilibration. Measurements were made for various temperatures and gas pressures spanning a range of trap occupation from nearly empty to nearly full. Trapping was found to be consistent with the presence of two types of traps with respective binding enthalpies of 0.52 eV and 0.43 eV. The number of traps and their binding enthalpies determined here are in good agreement with the values obtained in earlier studies using dynamic release methods. The number of traps was not changed by annealing at 200 exp 0 C, consistent with the identification of the two types of traps as helium bubbles and vacancy clusters. (ERA citation 09:040557)