Surface reflection properties of heavy ion optical potentials

The reflection coefficients for various heavy ion potentials are calculated in an approximation which includes a wave mechanical surface reflection term in addition to the semiclassical WKB-term. For potentials which are deep and strongly absorbing in the interior of the potential well reflection from the surface gives the dominant contribution to the reflection coefficients with small angular momenta. For shallow potentials these two terms are still not sufficient for the calculation of the reflection coefficients, indicating that higher order reflections are important.