Determination of the Direction and Rate of Movement of the Metal-Plasma Interface upon Ion-Plasma Treatment of Metals

摘要

A method for calculation of the variation of the number of atoms in the initial surface layer of a metal which interacts with energetic particles has been developed. This method takes into account the processes of sputtering, redeposition of sputtered particles and absorption of the radiation-generated intersti-tials on the surface according to a model proposed in Ref. [4]. The numerical calculations of the variation of the number (A) of atoms in the initial surface layer per one impinging particle have been carried out for the three projectile-metal combinations: He~+-Fe, Ar~-Fe and Kr~+--Fe. The results were obtained for the energy range 50-1000 eV and for different values of the redeposition coefficient. It has been shown that there exists an energy interval in the low-energy range of bombarding particles for which N> 0. This indicates the fundamental feasibility for the metal-plasma interface to move towards the plasma. This energy interval expands both with increasing mass of the projectile and with a rise of the redeposition coefficient. The numerical calculations have been compared with the experimental results.