In my MD simulation of damage cascade of fcc metals, like Cu or Au. I want to put the PKA atom at the free surface of my system. Consequently, some sputtered atoms will be created. My questions is, normally, how much distance when the atoms depart from the free surface, they should be considered as sputtered atoms? Or there are the other conditions should also be considered?
Can anybody give me some advice? Thanks very much for your help!
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