z+ ions with z = 2-4 and were invariably found to be higher than for the corresponding spontaneous eliminations. The results are interpreted as being due to a time-dependent KER, since the non-fixed energy in the transition state is increased for higher internal energies and shorter lifetimes of the reactant ions. These results are compared with time-resolved KER values obtained previously, using an ion trap/reflectron instrument, for C 2 elimination from C60 + . The two sets of data are modeled by finite heat bath theory (FHBT) using calculated rate energy dependencies. Calculations are performed using currently available informa- tion on the activation parameters. The dissociation is modeled with an Arrhenius pre-exponential factor, A = 5 × 10 19 s -1 (at a temper- ature kBT = 0.2 eV) and a vaporization (activation) energy ∆ Evap = 10.3 eV. Modeling the data necessitates inclusion of radiative decay in parallel with the dissociation. Radiative decay is dominant at times longer than a few microseconds.