GRAZING-ION-SURFACE INTERACTION AS A PROBE OF SURFACE-STATES

We propose a simple theoretical model for the study of the electronic structure of surface bands by the measurement of resonant charge trans fer between localized surface electrons and grazingly incident project iles. We present an analytic expression for the parallel Velocity depe ndence of the scattered charge-state fraction, and show how it can be used to estimate the Fermi level and width of the surface band.