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.