Photodissociation pathways and dissociation energy of C–Br bond of n-C 4H 9Br determined using velocity map imaging

Abstract

The photodissociation of n-C 4H 9Br at 232–267 nm has been investigated utilizing velocity map ion imaging. The two-dimensional images provide detailed information on the translational energy distributions and anisotropy parameters of the photoproducts (Br and Br*). The experimental data and our ab initio calculations indicate that the photodissociation in the investigated range originates from the three low-lying dissociative electronic states, as assigned as 1A″, 2A′ and 3A′ in C s symmetry. Then, the origins of the photofragments (Br and Br*) are assigned to the individual pathways. The dissociation energy of the C–Br bond of n-C 4H 9Br is determined to be D 0 = 333.4 ± 1.5 kJ/mol.