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- W2021010982 abstract "The extent of H-D mixing in the form of mixed-isotope methane formation during simultaneous H+/D+ bombardment of graphite was measured and found to be a sensitive function of H+ -D+ ion range separation. The result strongly supports the model that methane molecules are formed at the end of ion range in the bulk of graphite. A long steadily decreasing transient was observed in the methane emission when bombarding a virgin graphite sample with 10 keV D+ at 800 K. The effect was less pronounced for low density fine grain isographites (EK98) than for high density pyrolytic graphite (HPG99) and monocrystal carbons. We propose a model which attributes this transient to the creation of new internal “surfaces,” formed during ion irradiation along with ion-created micropaths. The increase in internal surface area effectively “dilutes” the inner surface hydrogen concentration in the region where incident hydrogen ions thermalize. We propose that, initially, methane molecules are formed mainly on inherent internal surfaces (pore and grain/crystallite boundary surfaces) in the region where hydrogen ions thermalize; then as damage builds up, newly produced internal “surfaces” also contribute to methane formation." @default.
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- W2021010982 date "1994-02-01" @default.
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- W2021010982 title "Subsurface methane formation in graphite due to exposure to H+ and D+" @default.
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- W2021010982 doi "https://doi.org/10.1016/0022-3115(94)90337-9" @default.
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