  Light-induced energy confinement in nanoclusters via plasmon excitations
influences applications in nanophotonics, photocatalysis, and the design of
controlled slow electron sources. The resonant decay of these excitations
through the cluster's ionization continuum provides a unique probe of the
collective electronic behavior. However, the transfer of a part of this decay
amplitude to the continuum of a second conjugated cluster may offer control and
efficacy in sharing the energy nonlocally to instigate remote collective
events. With the example of a spherically nested dimer Na20@C240 of two
plasmonic systems we find that such a transfer is possible through the resonant
intercluster Coulomb decay (RICD) as a fundamental process. This plasmonic RICD
signal can be experimentally detected by the photoelectron velocity map imaging
technique.
