Ion-momentum imaging of dissociative electron attachment dynamics in acetylene

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We present experimental results for dissociative electron attachment to acetylene near the 3 eV ²Πg resonance. In particular, we use an ion-momentum imaging technique to investigate the dissociation channel leading to C₂H- fragments. From our measured ion-momentum results we extract fragment kinetic energy and angular distributions. We directly observe a significant dissociation bending dynamic associated with the formation of the transitory negative ion. In modeling this bending dynamic with ab initio electronic structure and fixed-nuclei scattering calculations we obtain good agreement with the experiment.