Hydrogen trapping in molybdenum in the presence of radiation damage

Abstract

Hydrogen was implanted in samples of single crystal molybdenum, many of which had been previously damaged by 4He at 18 or 150 keV. The hydrogen implantations were at low energies, usually at 10 keV. Depth profiles (up to 200 nm) of the trapped hydrogen were obtained using the nuclear reaction 1H)(19F, [alpha][gamma])16O. A comparison of the trapping efficiency per dpa for both high and low helium concentrations, realized by the 18 and the 150 keV 4He implant, respectively, indicates that the presence of the implanted helium contributes to the trapping of hydrogen, possibly through the inhibition of damage annealing.