  In this work we have performed for the first time a systematic analysis of
the dissociation and fission pathways of neutral, singly and doubly charged
alanine dipeptide ions with the aim to identify the fission mechanism and the
most probable fragmentation channels of these type of molecules. We demonstrate
the importance of rearrangement of the molecule structure during the fission
process. This rearrangement may include transition to another isomer or a
quasi-molecular state before actual separation of the daughter fragments
begins.
