Abstract
Isothermal re-emission of hydrogen, implanted into graphite with 3 keV H 2 + ions up to different fluences at room temperature has been measured at 450, 500 and 600°C by means of the elastic recoil detection (ERD) technique. It is found that as the time of the post-isothermal annealing increases the concentration of hydrogen retained at each implantation fluence decreases rapidly in the beginning and hereafter very gradually. The decay curves due to hydrocarbon molecule emission are obtained as the differences between the experimental decay curves and the decay curves due to hydrogen molecule emission, calculated by fitting the solution of the mass balance equations to the experimental ones at large annealing times, where thermal detrapping, retrapping and local molecular recombination are taken into account without hydrocarbon molecule formation. The ratios of the rate constants of hydrocarbon molecule formation to trapping are determined by best fitting of the calculated decay curves due to hydrocarbon molecule emission to the experimental ones obtained in the above procedure. The ratios determined and the process of hydrocarbon molecule formation are discussed on the basis of the diffusion-limited reaction model.
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