We have studied effects of the damage caused by pre-irradiation of heavy ions on the trap sites of hydrogen implanted into aluminum. FOr this purpose, aluminum samples were first irradiated with 40-keV Al_2, 30-and 123-keV Si ions at a temperature of 125 K. Then, 30-keV H ions were implanted into the pre-irradiated samples after keeping them at 125 K for different time intervals in order to partially recover the irradiation damage. Dpeth profiles and the thermal behavior of hydrogen were obseved by an elastic recoil detection (ERD) method. The obtianed results were compared with those for non-irradiated pure aluminum samples. It was found that the disorder cused by heavy-ion irradiation and vacancies surviving without annihilation influence the trapping of hydrogen in the temperature range of stage-II frecovery.
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