Dissociative charge-transfer reactions of Ar + with chloromethanes at thermal energy

Abstract

Charge-transfer reactions of Ar + with CH n Cl 4− n ( n=1−3) at thermal energy have been studied by using a flowing-afterglow apparatus coupled with a low pressure chamber. Dissociative charge-transfer leading to CH + 3 (91 ± 5%), CH 2Cl + (95 ± 2%), and CCl + (69 ± 3%) are major product channels for CH 3Cl, CH 2Cl 2, and CHCl 3, respectively. Total rate constants are (1.3 ± 0.5) × 10 −9, (0.97 ± 0.42) × 10 −9, and (1.2 ± 0.6) × 10 −9 cm 3s −1 for CH 3Cl, CH 2Cl 2, and CHCl 3, respectively. These values amount to 57%–80% of the collisions rate constants estimated from either the Langevin or ADO theory.