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A molecuIar dynamics simulation has been used to study zero-fluence and low- bombarding63Cu-65Cu sputtering. Calculations show that the isotopic ratios at both θ≤35° and energy 63Cu-65Cu sputtering. Calculations show that the isotopic ratios at both θ≤35° and θ >35°, and the total isotopic ratio increase when the bombarding energy decreases. This result might impty the existence of the bombarding-energy-dependent momentum asymmetry.
A molecular Dynamics simulation has been used to study zero-fluence and low-bombarding 63 Cu-65 Cu sputtering. Calculations show that the isotopic ratios at both θ ≦ 35 ° and energy 63 Cu-65 Cu sputtering. Calculations show that the isotopic ratios at both θ ≦ 35 ° and θ> 35 °, and the total isotopic ratio increase when the bombarding energy decreases. This result might impty the existence of the bombarding-energy-dependent momentum asymmetry.