Role of reversibility in enhanced ion backscattering near 180° scattering angle

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Abstract
Computer simulations show that recently measured enhanced ion scattering near 180° originates in the reversibility property of ion trajectories. The simulation results explain the observed angular and depth dependence of the effect and predict a slight deficit in scattering at angles beyond the enhancement region that was not found experimentally. Collision-induced recoils of the target atoms and the depth resolution of the detector each produce sizable reductions in the effect, and their inclusion in the calculations in necessary for satisfactory agreement with experiment. The observed dependence on atomic number of the target is shown to be partly due to the nuclear charge and partly due to the dependence of target-atom recoils on mass. A calculation is also given of an enhancement to be expected under channeling conditions.