Neutralisation contributions in low energy ion scattering

Further studies of the contribution to neutralisation of the outgoing trajectory in low energy ion scattering are reported. The neutralisation model assumed to apply is that due to Hagstrum, with the probability of survival in an ionised state given by P+=A exp(-upsilonsub(c)/upsilonsub(perpendicular to)). The dependence of upsilonsub(c) on incident ion energy and angle of exit to the surface show the probability P+ is a function of upsilonsub(perpendicular to), and upsilonsub(c) itself is also a function of upsilonsub(perpendicular to). Thus the actual dependence of P+ on upsilonsub(perpendicular to) is less than that suggested by Hagstrum. Values of upsilonsub(c) suggest the contributions to neutralisation of the ingoing trajectory, the collision and the outgoing trajectory are approximately the same. (orig.)