The dynamics of excited electrons in C-60 for various film thicknesses down
to approximately one monolayer have been investigated. Using time resolved
two photon photoemission this gives a direct probe both for the electronic
structure of the normally unoccupied states and the population and depopul
ation of these states. It is shown that the relaxation mechanism at the met
al-semiconductor interface is quite different from the relaxation observed
in the bulk of C-60 (C) 2000 Elsevier Science Ltd. All rights reserved.