Abstract
The light-induced instantaneous quenching of second harmonic generation at C 60 interfaces is employed to measure the decay rate of C 60 excitons at various interfaces. While at C 60 surfaces a state with a life time longer than 20 ns is observed the C 60 quartz interface exhibits a short lived state (70 ps) ascribed to a decreased life time of C 60 excitonic states due to the proximity of the dielectric. The coupling between excitonic C 60 states and a metal surface can be varied by employing C 60/alkanethiol/Au sandwich structures with alkanethiols of different chain length. For spacer layers from 2.4 to 1.0 nm a decrease of the life time from 520 to 44 ps is observed.
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