Role of Negative-Molecular-Ion Resonances in Collisional Detachment:Cl−+N2

Double-differential studies of the fast neutrals (Cl) resulting from collisional detachment of ${\mathrm{Cl}}^{-}$ on ${\mathrm{N}}_2$ ($E_{\mathrm{lab}}<~300$ eV) show energy-loss peaks at 6 and 12 eV. It is noteworthy that a high-loss peak is dominant at low $E\theta$. Similar studies of the inelastically scattered ${\mathrm{Cl}}^{-}$ reveal significant vibrational-rotational excitation of ${\mathrm{N}}_2$ but no electronic excitation of the ${\mathrm{N}}_2$ is observed. Arguments are presented which support the hypothesis that the known negative-ion resonances of ${\mathrm{N}}_2$ are involved in the detachment processes.