Abstract
Experimental measurements of the magnitudes and azimuthal anisotropies of 4 keV ${\mathrm{Ne}}^{+}$ scattered ion fractions from both the Cd- and S-terminated surfaces of $\mathrm{CdS}{0001}$ exhibit high sensitivity to both surface structure and electron density. Using a density functional approach, a clear correlation has been demonstrated between these ${\mathrm{Ne}}^{+}$ 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.
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