Studies on photodissociation of alkyl bromides at 234 and 267 nm

We studied the photodissociation dynamics of alkyl bromides (CHBr3, CH2Br2, C2H5Br, C2H4Br2) near 234 and 267 nm using resonance-enhanced multiphoton ionization (REMPI) with time-of-flight mass spectrometer. After photodissociation of alkyl bromides, bromine fragments of Br (2P1/20) (denoted Br*) and Br (2P3/20) (denoted Br) released. Branching ratios of N(Br*)/N(Br) were determined, and a possible photodissociation mechanism of alkyl bromides was proposed. Additionally, the REMPI spectrum of bromine atoms has been recorded between 231 and 268 nm, 42 transition lines were found and assigned, and most of them coincided with the previous results except 12 atomic transitions that were new.