Journal of Physical Chemistry A, Vol.109, No.49, 11123-11126, 2005
Photodissociation study of 1,3-dibromopropane at 234 nm via an ion velocity imaging technique
The photodissociation of 1,3-dibromopropane has been studied at 234 nm using a 2D photofragment ion velocity imaging technique coupled with a [2 + 1] resonance-enhanced multiphoton ionization scheme. The velocity distributions for the Br (P-2(1/2)) (denoted Br*) and Br (P-2(3/2)) (denoted Br) fragments are determined, and each can be fitted by a narrow single-peaked Gaussian curve, suggesting that bromine fragments are generated as a result of direct dissociation via repulsive potential energy surfaces. The recoil anisotropies were measured to be beta = 0.80 for Br and 1.31 for Br*, and the product relative quantum yields at 234 nm is Phi(234 nm)(Br*) = 0.21.