Photodissociation of CF2ClBr at 234 nm via a state-resolved imaging technique

The dissociation dynamics of CF2ClBr at 234 nm is studied using a state-selected photofragment imaging technique. Two primary dissociation channels, CF2Cl + Br and CF2Br + Cl, are observed with the relative yields of 0.96 and 0.04. The energy partitionings of photofragments for these channels are explained in terms of the rigid and soft radical impulsive models, respectively. For the CF2Cl + Br channel, the branching ratio of Br(P-2(1/2)) and Br(P-2(3/2)) is determined to be 0.41 +/- 0.05 and the anisotropy parameters are found to be beta = 1.60 +/- 0.1 for Br(P-2(1/2)) and beta = 1.05 +/- 0.1 for Br(P-2(3/2)). It is proposed that the CF2Br + Cl process is due to intramolecular energy transfer from the C-Br bond. (C) 2001 Elsevier Science B.V. All rights reserved.