Abstract

Measurements of hydrocarbon release from graphite as well as from TiC have been performed as a function of temperature, ion flux and incident energy, using low energy hydrogen and deuterium ions. It has been found that the CH 4 desorption from graphite after turning off the ion beam has a longer tail than the desorption of H 2 and C 2 hydrocarbons, and that the amount of the CH 4 desorption increases with temperature, ion flux and incident energy. Contrary to graphite, the CH 4 desorption from TiC decays quickly, and the amount of the CH 4 desorption is so small that hydrogen atoms are mainly released from TiC in the form of H 2.

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