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Kinetic energy and angular distributions of O$^-$ ions formed by dissociativeelectron attachment to CO molecule have been studied for 9, 9.5, 10, 10.5, 11,11.5 eV incident electron energies around the resonance using time slicedvelocity map imaging spectrometer. Detailed observations clearly show twoseparate DEA reactions lead to the formation of O$^{-}$ ions in the ground$^{2}P$ state along with the neutral C atoms in ground $^{3}P$ state and firstexcited $^{1}D$ state, respectively. Within the axial recoil approximation andinvolving four partial waves, our angular distribution results clearly indicatethat the two reactions leading to O$^{-}$ formation proceed through thedistinct resonant state(s). For the first process, more than one intermediatestates are involved. Whereas, for the second process, only one state isinvolved. The observed forward-backward asymmetry is explained due to theinterference between the different partial waves that are involved in theprocesses.

Molecular Dynamics in Dissociative Electron Attachment to CO probed by Velocity Slice Imaging