RAINBOW SCATTERING OF CONVOY ELECTRONS NEAR SURFACES

We present a microscopic simulation of convoy electron emission in gla ncing-angle ion-surface scattering which accounts for both dynamic ima ge interactions and multiple scattering. We find that the position and shape of the convoy peak are determined by rainbow scattering of elec trons in the dynamically screened field of the ion. The nonclassical c ontribution to rainbow scattering is estimated using a uniform semicla ssical approach. Core polarization is shown to contribute significantl y to dynamical screening. Good agreement with experiment is found for Li+-SnTe(001) collisions.