Rate Enhancement of the Reaction of HCl with ClONO2 by Ions: Implications for the Mechanisms of Stratospherically Important Heterogeneous Reactions
Abstract
We report the first observation of the ion-assisted neutral reaction of HCl with ClONO2. These two species react efficiently in the gas phase to form nitric acid and chlorine when one or the other is clustered to an NO3(-) core ion. Utilizing a selected ion flow tube we find that reaction 1 proceeds with a rate coefficient of 1.8 x 10(exp -9) cu cm/s at 233 K and that reaction 2 proceeds with a rate coefficient of 1.5 x 10(exp -9) cu cm/s at 283 K, values near the collision rate coefficient. Minor channels involving ligand switching were also observed. In contrast, the rate coefficient for the neutral species HCl and ClONO2 is small, less than 1 x 10(exp -20) cu cm/s. Few reactions of this type, where the core ion enhances the rate of the reaction without apparently being chemically transformed, have been reported.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 19, 1994
- Accession Number
- ADA284582
Entities
People
- Albert A Viggiano
- Jane M. Van Doren
- Robert A. Morris
Organizations
- Phillips Laboratory