Dissociative electron attachment to polyatomic molecules: Ion kinetic energy measurements

Dissociative electron attachment to SO2, NO2, NF3 and H2O2 is studied in terms of the kinetic energies of the dominant fragment ions. The O- data from SO2 show that the two major resonances at 4.6 and 7.2 eV respectively have the same dissociation limit. Similarly, the resonances at 1.8 and 3.5 eV in the O- channel in NO2 appear to have same dissociation limit of NO (X 2[Pi]) + O-, while the resonance at 8.5 eV appears to dissociate to give NO (a 4[Pi]i) along with O-. We find considerable internal excitation of the neutral fragments in all these cases along with that of NF3, whereas the negative ion resonance in H2O2 appears to fragment almost like a diatomic system with very little internal excitation of the OH and OH- fragments.