Abstract
The influence of damping in an electron gas on ion-cluster energy loss is determined using the Mermin form of the dielectric response function. In a stopping medium corresponding to carbon, the vicinage function is modified significantly compared with the zero-damping limit for a dicluster with its axis parallel to its velocity. This change results in variations in dicluster stopping power of \ensuremath{\sim}20% as a function of internuclear separation compared with the small-damping values. For the dicluster axis oriented at random or perpendicular to the velocity, only small changes in dicluster stopping power occur beyond those accounted for by increases in mean excitation energy with increasing damping.
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