Investigation of the Carbon Monoxide Dication Lifetime Using (CO)$_2$ Dimer Fragmentation
Résumé
The fragmentation of carbon monoxide dimers induced by collisions with low-energy ions is investigated using the cold target recoil ion momentum spectroscopy technique. The presence of a neighbor molecule in the dimer serves here as a diagnostic tool to probe the lifetimes of the molecular dications resulting from the collision. The existence of metastable states with lifetimes ranging from 2 ps to 200 ns is clearly evidenced experimentally through a sequential three-body fragmentation of the dimer, whereas fast dissociation channels are observed in a so-called concerted three-body fragmentation process. The fast fragmentation process leads to a kinetic energy release distribution also observed in collisions with monomer CO targets. This is found in contradiction with the conclusions of a previous study attributing this fast process to the perturbation induced by the neighbor molecular ion.
Domaines
Physique Générale [physics.gen-ph]| Origine | Fichiers produits par l'(les) auteur(s) |
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