Fission of doubly charged sodium clusters is studied using the open-shell two-center deformed jellium model approximation and it ab initio molecular dynamic approach accounting for all electrons in the system. Results of calculations of fission reactions Na_10^2+ --> Na_7^+ + Na_3^+ and Na_18^2+ --> 2 Na_9^+ are presented. Dependence of the fission barriers on isomer structure of the parent cluster is analyzed. Importance of rearrangement of the cluster structure during the fission process is elucidated. This rearrangement may include transition to another isomer state of the parent cluster before actual separation on the daughter fragments begins and/or forming a "neck" between the separating fragments.
Latest Advances in Atomic Cluster Collisions: Fission, Fusion, Electron, Ion and Photon Impact, 2004, p. 157-168