Apart from emission of one or more neutral particles as H-atom(s)/H 2 molecule(s), we have also inferred emission of neutral C 2 H 2 from parent dication C 4 H 2+ 6 , from the coincidence map. We observed a coincidence island with fragment pair (H + , C 2 H + 3 ) and having a slope close to -1 indicating formation of precursor dication is C 2 H 2+ 4 . This process may be represented as