Abstract
The reactions of atomic hydrogen with four different types of graphite have been investigated with and without simultaneous 5 keV Argon ion bombardment. It has been found, that the scatter in the reaction probability of atomic hydrogen is the same for different samples of one graphite type as well as for different types of graphite. Under simultaneous ion bombardment the reaction rates between different graphites have been found to be equal within our experimental error. Ni contamination drastically decreases the chemical reactivity of graphite by bombardment with atomic hydrogen alone. Simultaneous Ni-deposition during H-atom and Ar +-ion bombardment of graphite results in a somewhat slower decrease of the chemical reactivity indicating an ion induced mixing of the nickel in the near surface layers of the graphite.
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