Abstract: The Photodissociation dynamics of C8H17Br with excitation laser at 234 nm has been studied using velocity map ion imaging. The relative quantum yields are obtained from (2+1) resonance-enhanced multiphoton ionization (REMPI) of the photofragment Br*(2P1/2) and Br(2P3/2). The velocity maps provide detail information on translational energy distributions and angle distributions. The probabilities of the individual pathways of the fragments are calculated from the relative quantum yield and angular distribution. The results indicate that a large fraction of the available energy translates into the internal energy of the fragments, which can be explained using the soft impulsive model. The relationship between the energy partition and the alkyl structure has been analysed.

Key words: C8H17Br, Velocity map ion imaging, Resonance-enhanced multiphoton ionization, Relative quantum yields