Abstract
In the present study the correlation between annealing effects of damage and release of implanted deuterium into graphite was investigated through the behavior of deuterium in the graphite during D 2 + implantation. From the results of TDS experiments, the thermalized deuterium participated to form trapping sites. However the energetic deuterium would directly form CD x−1 ( x=2, 3, and 4) and simultaneously its kinetic energy was transferred to carbon atoms, and then this resulted in changing the electronic state of carbon from the sp 2 state to the sp 3 state. Those processes dominated during D 2 + implantation at lower temperatures below 573 K. On the other hand, at higher implantation temperatures above 573 K, the disordered structure of the graphite was recovered to a crystalline graphite structure and then deuterium release was started. The effects of heating the sample, known as thermal annealing effects, were correlated with the hydrogen release from the graphite.
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