Dissociative charge transfer and collision induced dissociation of Ar_2~+ and Ar_3~+ clusters in collisions with argon atoms at keV energies

摘要

The dynamics of dissociative charge transfer and collision induced dissociation of Ar_2~+ and Ar_3~+ clusters colliding with Ar atoms at 4.8 keV has been investigated using a novel multifragment detection scheme that maps the postcollision vectors of all particles simultaneously.Estimation of internal energies and measurement of pre-and postcollision vectors enables a full description of reaction dynamics.The prominence of electronic excitation in defining the dynamics of these collision systems is demonstrated.The dissociation dynamics of Ar_3~+ clusters is distinctly different from that of Ar_2~+.This is attributed to a combination of lower internal energies and predominantly triangular T-shape structure of the Ar_3~+ ion.