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 surface s of CdS{0001} exhibit high sensitivity to both surface structure and elect ron density. Using a density functional approach, a clear correlation has b een demonstrated between these Ne+ ion fractions and the lateral variation of the electrostatic potential along the outgoing trajectories of the scatt ered 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. [S0031-9007(98)07848-X ].