Abstract
We consider Na clusters on NaCl surfaces as examples of metal clusters attached to an insulating substrate. We concentrate on the cases Na 8 and Na 20 where three-dimensionally extended clusters compete with planar clusters and compute the optical response of ground states and isomers using the time-dependent local-density approximation. The interface interaction leads to strong deformations of the deposited clusters. Nonetheless, one sees a well-developed plasmon response which allows conclusions to be made on the underlying cluster structure (planar or three-dimensional).
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