Reaction of vibrationally excited HBr and I

The rate of the reaction HBr(ν) + I → HI + Br increases by at least a factor of 10⁹ when HBr(ν=0) is excited to HBr(ν 2). The increase is observed when the reacting level is directly excited by sequential laser excitation or when it is populated by collisional excitation. Bromine isotopic enrichment in BrI, the product of a subsequent reaction, was observed after isotopically selective excitation.