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The fragmentation of carbon monoxide dimers induced by collisions with lowenergy Ar$^{9+}$ ions is investigated using the COLTRIMS technique. Thepresence of a neighbor molecule in the dimer serves here as a diagnostic toolto probe the lifetimes of the $\rm CO^{2+}$ molecular dications resulting fromthe collision. The existence of metastable states with lifetimes ranging from2~ps to 200~ns is clearly evidenced experimentally through a sequential 3-bodyfragmentation of the dimer, whereas fast dissociation channels are observed ina so-called concerted 3-body fragmentation process. The fast fragmentationprocess leads to a kinetic energy release distribution also observed incollisions with monomer CO targets. This is found in contradiction with theconclusions of a former study attributing this fast process to the perturbationinduced by the neighbor molecular ion.

Investigation of the Carbon Monoxide Dication Lifetime Using (CO)$_2$ Dimer Fragmentation