Dissociation Dynamics of Anionic Carbon Dioxide in the Shape Resonant State 2 Π u .

Dissociative electron attachments via the lowest shape resonant state 2 Π u of CO 2 - , e - + CO 2 → O - + CO, are investigated with our high-resolution anion velocity map imaging apparatus. The production efficiency curve of O - obtained in this work is consistent with those reported previously. The forward-backward asymmetric distribution superimposed on the isotopic background is observed in the time-sliced velocity image of O - yield, implying that the dissociation of CO 2 - ( 2 Π u ) proceeds through a combinational motion of bond stretching and bending. Thereby, the coproduct CO is proposed to be in the rovibrational states. The long-standing arguments about the dissociation dynamics of CO 2 - ( 2 Π u ) are settled.