Comment on erosion of graphite

Radiation enhanced sublimation - the interstitial model to explain the radiation enhanced sublimation has been further proved. It predicts a threshold down to small energies similar as for the production of Frenhel pairs. A flux dependence is predicted, so that the yield cell decreases proportional to (P)314 (P: Frenhel pair production rate). Chemical erosion of hydrocarbon films; which the chemical erosion of pure graphite differs significantly when using either thermal atomic hydrogen or energetic ions (yield increases from 5 x 10-4 to ∼5 x 10-2 C/H), a-C:H films are highly reactive against atoms alone. The erosion yield of a-C:H films when bombarded with thermal atoms is in the maximum 800k of the order 0/10-1 and so similar as that of energetic ions on these films which is quite similar to the yield of pure graphite. It has been further found that hydrogen saturated graphite layers show also a high reactivity against atoms alone