Laboratory studies of negative ion reactions with atmospheric trace constituents

A flowing afterglow system has been used to measure 296°K reaction rate constants and equilibrium constants for a number of negative ion reactions with atmospheric constituents. Three‐body association reactions of ${\mathrm{O}}^{-}\mathrm{,\hspace{0.17em}}{\mathrm{OH}}^{-}\mathrm{,\hspace{0.17em}}{\mathrm{O}}_2^{-}\mathrm{,\hspace{0.17em}}{\mathrm{O}}_3^{-}\mathrm{,\hspace{0.17em}}{\mathrm{Cl}}^{-}\mathrm{,\hspace{0.17em}}{\mathrm{CO}}_3^{-}\mathrm{,\hspace{0.17em}}{\mathrm{OH}}^{-}({\mathrm{H}}_2\mathrm{O})$ , and ${\mathrm{O}}_2^{-}({\mathrm{H}}_2\mathrm{O})$ with H₂O have been measured and association rate constants for several ions with CO₂ and SO₂ have been measured. A number of binary reactions for these ions and their hydrates have been measured with H₂O, CO₂, SO₂, NO₂, O₃, and NO. Some equilibrium constants for negative ion hydration and some equilibrium constants for solvent (H₂O, CO₂, and SO₂) exchange to several negative ions are reported.