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The ion–molecule reactions of state selected HCl +  ( v,N ) ions with carbon dioxide and ethene have been investigated. For the reaction HCl + +CO 2  proton transfer leading to the HOCO +  ion is the only reaction channel observed. For the reaction HCl + +C 2 H 4  very efficient charge transfer (leading to C 2 H 4  + +HCl) dominates at low particle densities. At higher densities consecutive reactions leading e.g. to C 2 H 2  + , C 2 H 3  + , and C 2 H 5  +  take over. A kinetic model is presented which allows to derive rate constants for the relevant elementary reactions. Under the current experimental conditions the rate constants are found to be independent of the rotational angular momentum  N  of the HCl +  ions.

Ion–Molecule Reactions of State Selected HCl + Ions with Carbon Dioxide and Ethene