COMPUTER-SIMULATION OF SINGLE-CRYSTAL AND POLYCRYSTAL SPUTTERING .2.

Examination of the results of computer simulation of Cu single-crystal and polycrystal sputtering by 27 kev Ar ions started in Part I of this work is continued. The spatial and energy distributions of all sputtered atoms and various sputtering components are analyzed. The incidence angles alpha equals 45 degree and 85 degree are taken as examples. The sputtering is shown to be mainly near the LT AN BR 110 RT AN BR and LT AN BR 100 RT AN BR axes and also, especially in the case of glancing incidence, near a plane perpendicular to the ion beam. The mechanisms of predominant sputtering are discussed in detail. The importance of linear collision chains and correlated collisions of the incident ions with the atomic rows of a crystal lattice is emphasized. It is noted that bombardment of a crystal under semichanneling conditions is favorable for the target to be sputtered in the form of clusters. In connection with Harrison's recent remakrs on Sigmund's sputtering theory, the relationship of the energy of sputtered atoms to the depth of their production in a crystal is examined. The mean depth from which the sputtered atoms are ejected has been found to be a nonmonotonic function of their energy.