Nonadiabatic-coupling-mediated argon dimer dissociation by slow and low-charge-state ion collisions
Résumé
Weakly bound systems provide possibilities to study nonlocal electronic decay processes, which present unique physical and chemical properties. Here we report the experimental observation of a nonlocal decay process, i.e., nonadiabatic-coupling-mediated charge transfer (NCMCT), in argon dimer. This process can be effectively produced and manipulated by the double electron capture in low-charge-state oxygen ion collisions. Compared to other common decay mechanisms of Ar 2 dication, the NCMCT process results in notably different kinetic energy releases for the Ar$^+$ + Ar$^+$ channel. It is due, revealed by theoretical calculations, to the special potential energy curve of the responsible Ar$^{2+}$ -Ar state that possesses many crossing points and thus nonadiabatically couples with the Ar$^+$ -Ar$^{+*}$ states in a wide internuclear distance range. Such an NCMCT process is expected to be a general process occurring in weakly bound systems when highly excited. The present work provides a prime collision system to explore the charge transfer in ion-molecule reactions and also brings insight into cluster dissociation mechanism.
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