Energy dependence of methane production during deuteron bombardment of pyrolytic carbon

Plasma-surface interactions in tokamaks

“…where Q t is the heat of the reaction forming methane, Q 2 is the adsorption energy for the hydrogen atoms, and A and r 0 are constants. It can be shown that a maximum exists in this curve, and by independent measurement of the detrapping cross-section, a, it has been shown that the change in the position and height of the maxima with incident ion energy and primary beam current density J o can be accounted for in terms of the changing detrapping cross-section [77]. Results are shown in Fig.…”

“…15. However, the importance of ion-induced detrapping has more recently been realized, and it has been shown to play an important role both in recycling and in other surface effects [49,77,78]. This process, whereby an incident ion desorbs an atom previously trapped in the solid lattice, has been studied in detail for the rare gases [72,79].…”