Abstract
The steady state depth profile of hydrogens retained in graphite by implantation has been calculated by solving the mass balance equations including a new model for their release which occurs by local molecular recombination of an activated hydrogen with a trapped one. The rate constants of such molecular recombination are determined by fitting the calculated flux dependence of the peak concentration of retained hydrogens with the experimental one. Moreover, it is shown that the mass balance equations well reproduce the experimental release profile induced by 1.5 MeV He + bombardment. The effective detrapping cross-sections for trapped hydrogens are determined and from them the ratios of the rate constants for trapping to recombination are estimated using the detrapping cross-sections calculated as the average of the displacement cross-sections for trapped hydrogens by the nuclear collisions of recoil carbons.
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