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 (X2Π) + O−, while the resonance at 8.5 eV appears to dissociate to give NO (a4Πi) 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.

Kinetic energy of dominant ions from dissociative electron attachment to SO2, NO2, NF3 and H2O2 are measured to obtain the dissociation limits of various negative ion resonances and the energy budget of the process.Figure optionsDownload as PowerPoint slide