Reevaluation of the temperature dependence of the reactions of Cl+ and HCl+· with H2

Abstract

The temperature dependence of the reaction of Cl⁺ with H₂ has been the subject of several recent studies. The interest in this reaction derives mainly from its importance in modeling chlorine chemistry in interstellar clouds. New data on this reaction are reported that suggest the reaction has a weak negative temperature dependence in agreement with recent flow tube studies. Data for the HD and D₂ isotopic species show the same trend. New data on the HCl⁺ + H₂ reaction are also reported.