Photodissociation study of 1,2-C 2H 4BrCl at 234 and 267 nm by the ion-velocity imaging technique

Abstract

The photodissociation of 1,2-C 2H 4BrCl has been investigated at 234 and 267 nm using the ion-velocity imaging technique. The images of the bromine fragments show the characteristics of a direct dissociation process and the extracted anisotropy parameters indicate the molecules are mainly excited to 3Q 0 state at both wavelength. A new decomposition channel on the ground state was observed. It was attributed to internal conversion from the excited electronic state to the ground state. The product quantum yields were measured to be Ф 234nm(Br ∗) = 0.39 and Ф 267nm(Br ∗) = 0.25, and the contribution of each state to the product was estimated.