The fragmentation dynamics of $\mathrm{NC}\mathrm{C}{\mathrm{N}}^{2+}\mathrm{and}{\mathrm{NCCN}}^{3+}$ produced by 1-keV electron impact have been investigated using the ion momentum imaging technique. Five two-body and two three-body fragmentation channels are identified including two isomerization pathways. The reaction coordinates of isomerization channels were investigated by quantum chemistry calculation. By measuring the momentum vectors of the fragment ions, the kinetic energy release distributions have been determined. With the help of the Dalitz plot, Newton diagram, and native-frame method, we investigated the fragmentation mechanisms of the three-body fragmentation channels. It is found that the channel ${\mathrm{NCCN}}^{3+}\to {\mathrm{N}}^{+}+{\mathrm{N}}^{+}+{\mathrm{C}}_2^{+}$ only dissociates via the concerted mechanism, while channel ${\mathrm{NCCN}}^{3+}\to {\mathrm{C}}^{+}+{\mathrm{N}}^{+}+{\mathrm{CN}}^{+}$ presents two sequential fragmentation processes with $\mathrm{C}{\mathrm{N}}^{2+}$ and ${\mathrm{C}}_2{\mathrm{N}}^{2+}$ as intermediate moieties in addition to the concerted fragmentation.

Close

PrevNext

View figure in article

• Atomic & molecular structure
• Electron & positron scattering
• Ion impact & scattering