Abstract
The reactions of atomic hydrogen with pyrolytic graphite have been investigated by an atomic beam technique. Up to temperatures of 800 K atomic hydrogen reacts with graphite forming CH 4 and C 2-compounds with a reaction probability of about 2 × 10 −4. Above 1000 K no hydrocarbons have been found. A hydrogen atom exposure of the graphite with simultaneous bombardment by Ar + ions drastically enhanced the hydrocarbon formation up to a factor of 100 exhibiting a characteristic temperature behaviour with a maximum at about 800 K. As main reaction product CH 3 is formed together with some CH 4 and C 2-compounds. When the Ar + beam is turned off the enhancement of the reaction probability is only slowly decreasing with further hydrogen bombardment. In contrast to ion bombardment no significant influence of simultaneous electron irradiation on hydrocarbon formation has been observed.
Published Version
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