Model of cratering by single ions in heavy metals

In the model of the nonlocal thermoelasticpeak (NTP) of ion the theoretical investigation of nanocratering in targets of heavy metals at bombardment by ions Xe⁺ with energy from 25 eV up to 30 keV is carried out. Simulation using program package SRIM2008 has shown possibility of formation of subsurface singly connected cascade with energy capacity sufficient for arising of the droplet sputtering for Ag targets. Calculations have shown opportunity of cratering on surface of Ag flat targets with yield strength <0.1 GPa at bombardment by Xe⁺ ions with energy E > 10 keV. Craters are not formed on Pt flat targets. Possible influence of nanoscale roughness on cratering by single ions is discussed. (paper)