Spatial distribution of recoiling atoms with a specific momentum generated in a collision cascade

Abstract

The spatial distribution of the momentum spectrum of recoiling atoms in an elastic collision cascade, produced by an energetic ion injected into a random solid, is investigated. Recoils are counted when accelerated from rest, or decelerated from above an energy boundary $E_1$ into an energy interval [$E_0, E_0+d{E}_0$] in a single collision. Pronounced cascade anisotropies are observed, the magnitude and direction depending on the recoil energy and the depth.