Retention of hydrogen in graphite

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Abstract
The retention of hydrogen in POCO AXF-5Q graphite has been measured at room temperature as a function of fluence and flux for H+2 ions at energies from 250 to 500 eV provided by a glow discharge. More than 2×1018 H/cm2 has been retained, and no indication of saturation has been observed to a fluence of 5×1019 H/cm2. In this experiment retention was found to increase linearly with fluence for constant flux. A flux dependence was observed; i.e., the retention rate was observed to decrease monotonically as the flux increased. A changeover experiment, deuterium to hydrogen, was conducted; the results show that significant changeover occurs (i.e., about 30% changeover for a fluence of 5×1017 D/cm2).

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