Communication: Imaging the indirect dissociation dynamics of temporary negative ion: N _2O ~- → N _2 O ~-

摘要

We reported an imaging study of the dissociation dynamics of temporary negative ion N _2O ~- formed in the low-energy electron attachment, e ~- N _2O → N _2O ~- → N _2 O ~-. With the help of ab initio molecular dynamics calculations, the evolution of momentum distributions of the O ~- fragment in terms of the electron attachment energy is identified as the result of a competition between two distinctly different indirect pathways, namely, climbing over and bypassing the energy ridge after the molecular structure bending. These two pathways prefer leaving the N _2 fragment at the high vibrational and rotational states, respectively.