Abstract
the present work by means of positron annihilation spectroscopy. The lattice defects were characterized by positron lifetime spectroscopy. Moreover, defect depth proflles were studied by slow positron implantation spectroscopy. The experimental investigations were accompanied by flrst principles theoretical calculations of positron parameters. It was found that irradiationinduced vacancies in Nb specimens are surrounded by H, which causes a shortening of the lifetime of trapped positrons. The in∞uence of a Pd and Cr over-layer on the H concentration in the Nb specimens was examined.
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