Abstract

Fragmentation pathways of small doubly charged lithium-atom and potassium-atom clusters are investigated in two domains of size. Around the critical size of stability an asymmetric fission process is observed in competition with the unimolecular dissociation. For smaller sizes the trends are in favor of more symmetrical fission channels. Whatever the size is, fission is shown to occur preferentially via the trimer ion. Energetic considerations explain the main features.

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