Abstract
The formation of volatile hydrocarbons by bombarding the surface of pyrolytic graphite with thermal and energetic hydrogen atoms has been studied above room temperature using a special massspectrometric technique. In the reaction of thermal atomic hydrogen with pyrolytic graphite the formation of the radical CH3 and C2Hx-species (predominantly C2H4 as well as C3HX has been observed. The reaction probability drastically increases when using either energetic hydrogen ions or a bombardment with any kind of energetic ions concomitant to the exposure to the thermal hydrogen atoms. Bombardment of the graphite with energetic oxygen ions results in the formation of CO and CO2 with an overall reaction rate near one. Energetic hydrogen ions are stored in the graphite within the range of their penetration until a critical saturation level of H/C of 0.5 is achieved.
Published Version
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