Abstract
The migration and nucleation of helium atoms in gold has been studied between 10 and 900 K using the perturbed γ-γ angular correlation technique. Helium doping of the samples by implantation leads to the production of intrinsic lattice defects. The experiments reveal that vacancies act as nucleation centres for helium atoms. The influence of helium dose and helium implantation energy was investigated. Below 250 K, no helium mobility was observed. Above 250 K, four different helium-vacancy configurations (He mV n) with different stabilities were detected. Above 900 K the helium-vacancy configurations vanish in agreement with the results of desorption experiments.
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