[en] Electron Impact ; Ketene ; Positive and Negative ions
[fr] Appearance energies ; Thermodynamic data
[en] Dissociation processes leading to positive and negative ions in ketene are discussed on the basis of appearance potential measurements. All important positive and negative ions are examined. For the negative ions, only resonance dissociative attachment processes are considered. Excited electronic states of negative ions, in particular for O-, may explain the structure observed in the dissociative attachment efficiency curves.