Reactions of NO2− and NO3− with HCl and HBr

Abstract

Reactions of ${\mathrm{NO}}_2^{-}$ and ${\mathrm{NO}}_3^{-}$ with HCl and HBr were carried out in a flowing afterglow system at room temperature and the reaction rate constants were measured. The reaction ${\mathrm{NO}}_3^{-}+\mathrm{HBr}\to {\mathrm{Br}}^{-}+{\mathrm{HNO}}_3$ is found to be nearly thermoneutral. The results lead to these values of electron affinities: $\mathrm{E.A.}({\mathrm{NO}}_2\text{)< 2.6\hspace{0.17em}}\mathrm{eV},\mathrm{E.A.}({\mathrm{NO}}_3\text{)=3.9± 0.2\hspace{0.17em}}\mathrm{eV}$ . In addition, rate constants for the reactions of NO⁻ and ${\mathrm{O}}_2^{-}$ with HCl are reported. A number of cluster ions were observed: ${\mathrm{NO}}_3^{-}(\mathrm{HCl}{)}_{\text{1,2}},{\mathrm{NO}}_3^{-}({\mathrm{HNO}}_3{)}_{\text{1,2}},{\mathrm{NO}}_3^{-}·{\mathrm{HNO}}_3(\mathrm{HCl}{)}_{\text{1,2}}$ , and Br⁻ (HNO₃)_1,2.