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Ion reflection based on a two-target-atom model is considered. In this approximation simple estimates of the angular distribution for small sliding angles are obtained (with or without thermal vibrations of atoms). The energy spectra in this case are also discussed. [Russian Text Ignored].

The reflection of argon ions with an energy of 50 to 500 eV from a copper single crystal is simulated on a digital computer. Three models are used to describe the interaction of the projectiles with the crystal: 1. the ion interacts in each moment only with the nearest crystal atom, 2. the ion interacts with all atoms of some microcrystallite whose atoms are assumed to be free, 3. the ion interacts with a microcrystallite of bound lattice atoms. For the Ar+–Cu and Cu–Cu interaction we use the Born-Mayer potential. A comparison of the results on the spatial and energy distributions of the ions in the different models is made. [Russian Text Ignored].