Abstract
Ab initio calculations of 0.01--10 eV collisions of positrons with fullerene ${\text{C}}_{20}$ are performed using a single-center expansion of the total wave function and a model potential to represent the positron-molecule interaction. Total elastic cross sections and eigenphase sums are generated and analyzed, while bound states and possible long-lifetime scattering resonances are explored, particularly those which are found to reside within the cage structure defined by the carbon atoms of the cluster.
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