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A saturated bilayer of hydrogen isotopes has been formed in graphite by implanting protons and deuterons at different energies. Residual gas analysis during thermal desorption strongly suggests that hydrogen atoms recombine locally in the bulk of the damaged material and diffuse to the surface in molecular form. This model of local recombination and molecular diffusion is consistent with the predictions of the local saturation model. It also explains recent data of the low-energy chemical erosion during hydrogen bombardment at room temperature.

Trappin g and detrapp ing of low energy hydroge n isotope s in graphi te is relevan t to the collect ion of fuel partic les in graphi te probes for diagno stics of particl e fluxes and energie s in the plasma bounda ry layer, and to therec vclino of fuel partic les. The measure mept of saturat ion concen tration s by c(. profili ng of D may be influen ced by detrapp ing of deuteri um by the analyzi ng 3He-bea m.

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