Ionization and dissociation fractions of CO2under 10–30-keV H−, C−, and O−negative-ion impact

Abstract

The ionization and dissociation fractions of the CO${}_{2}$ molecule under the impact of 10--30-keV negative ions H${}^{\ensuremath{-}}$, C${}^{\ensuremath{-}}$, and O${}^{\ensuremath{-}}$ are studied. The four recoil ions originating from the target molecule CO${}_{2}$ (CO${}_{2}{}^{+}$, CO${}^{+}$, O${}^{+}$, and C${}^{+}$) are measured and identified in coincidence with projectiles in two final charge states ($q=0$ and $q=+1$) by using a time-of flight spectrometer. The ionization and dissociation fractions of CO${}_{2}$ are found to associate with the momentum of the impacting ions. We also analyze the fractions for ionization and dissociation from a physical point. No comparison is given since no other experimental and theoretical data exist in the investigated energy range.