Angular distributions in electronically adiabatic hyperthermal collisions. An eikonal approach

A general method is described to calculate transition integrals, including phase interference effects, from eikonal wave functions. It introduces Jacobians to evaluate the divergence of trajectory bundles, and to transform integration variables from space coordinates to trajectory coordinates. Calculations are performed for angular distributions in Li+Hg and H2+Hg collisions using Lennard-Jones potentials that are compared with accurate partial-wave sums. Very good agreement is found at hyperthermal collision energies.