Dissociative ionization of ${\mathrm{O}}_2$ produced by 1-MeV ${\mathrm{H}}^{+}$, ${\mathrm{He}}^{+}$, and ${\mathrm{O}}^{+}$

Kinetic-energy spectra of the ${\mathrm{O}}^{+}$, ${\mathrm{O}}^{2+}$, and ${\mathrm{O}}^{3+}$ fragments produced by 1-MeV ${\mathrm{H}}^{+}$, ${\mathrm{He}}^{+}$, and ${\mathrm{O}}^{+}$ projectiles have been obtained. The ${\mathrm{O}}^{+}$ spectrum resulting from ${\mathrm{H}}^{+}$ bombardment is similar to spectra obtained by electron bombardment and photoionization. In addition, an ${\mathrm{O}}^{2+}$ spectrum resulting from ${\mathrm{H}}^{+}$ bombardment has been obtained. The ${\mathrm{O}}^{+}$, ${\mathrm{O}}^{2+}$, and ${\mathrm{O}}^{3+}$ spectra obtained from ${\mathrm{He}}^{+}$ and ${\mathrm{O}}^{+}$ bombardment show energy groups for which approximate energy assignments have been made. The relative intensities of these energy groups are dependent on the projectile, with ${\mathrm{O}}^{+}$ projectile greatly enhancing the higher-energy groups relative to the ones of lower energy.