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Time-resolved fragmentation measurements have been performed on stored, size-selected gold cluster ions Au n ϩ (nϭ17-21) that have been excited up to 15 eV by multiphoton absorption. These excitation energies are far above the clusters' dissociation thresholds and initiate multistep sequential unimolecular dissociation by evaporation of neutral monomers. The measurements allow for the determination of a combination of kineticenergy release and radiative cooling of the excited clusters. Also,doi:10.1103/physreva.66.033201 fatcat:ku6efnvpffc6rnsubypduwgiwa