The generation of focused collision sequences in irradiated crystals: A calculation based on the inverse square potential

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Abstract
Of central importance in radiation damage theory is the function X(E, E′) dE′ giving the number of focused collision sequences generated with energy in the interval dE′ at E′ by a primary recoil of energy E. Previous calculations have used a hard-sphere model for interatomic collisions in a collision cascade. Here, the calcuiations for the cascade are based on collisions with an interaction potential depending on the inverse square of the interatomic separation. Focused collisions are treated with a Born-Mayer potential A exp(-r/b). Hence, for f.c.c. crystals: where D is the nearest-neighbour separation and Ef the focusing energy. It is shown that when this function is used to predict the energy spectrum of sputtered atoms, better agreement with observations is obtained than with the previous hard-sphere models.

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