Low-Pressure Study of the Reaction of Cl Atoms with Isoprene
| Autor: | Georges Le Bras, Yuri Bedjanian, G. Laverdet |
|---|---|
| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry A. 102:953-959 |
| ISSN: | 1520-5215 1089-5639 |
| Popis: | The kinetics of the reaction of chlorine atoms with isoprene (1) has been studied using the discharge-flow mass-spectrometric method: Cl + C5H8 (+M) → C5H8Cl (+M) (1a); Cl + C5H8 → C5H7 + HCl (1b). As a result of direct and relative measurements, the overall rate constant k1 = (6.7 ± 2.0) × 10-11 exp{(485 ± 85)/T} cm3 molecule-1 s-1 was obtained at a pressure of 1 Torr of helium over the temperature range 233−320 K. k1 was found to be pressure-independent (within 10%) at T = 298 K in the pressure range 0.25−3 Torr. Both HCl and C5H8Cl adduct were detected as products of reaction 1. The measurements of the HCl yield as a function of temperature led to the branching fraction for the H-atom abstraction channel (1b): k1b/k1 = (1.22 ± 0.4) exp{−(595 ± 90)/T} (P = 1 Torr, T = 233−320 K); k1b/k1 = 0.169 ± 0.022 at 298 K. The results are compared with those reported in a recent study4 carried out at 298 K. In addition, the rate coefficient has been measured for the reaction Cl + Br2 → BrCl + Br (2), which was u... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|