Surface Structure and Electron Density Dependence of Scattered Ne⁺ Ion Fractions from Cd- and S-Terminated CdS{0001} Surfaces

Experimental measurements of the magnitudes and azimuthal anisotropies of 4 keV Ne⁺ scattered ion fractions from both the Cd- and S-terminated surfaces of CdS{0001} exhibit high sensitivity to both surface structure and electron density. Using a density functional approach, a clear correlation has been demonstrated between these Ne⁺ ion fractions and the lateral variation of the electrostatic potential along the outgoing trajectories of the scattered Ne atoms. The observed anisotropy in the ion fractions is a result of the variations in surface to atom electron transfer rates due to tunneling barriers introduced by the electrostatic potentials.