Kinetics of the reaction of bromine atoms with molecular fluorine

Abstract

The rate constant of the reaction of bromine atoms with molecular fluorine is determined by mass spectrometrically monitoring BrF produced at fixed reaction time as a function of the concentration of F₂ added to a flowing mixture of Br and Br₂ in He diluent. The rate constant is 1.31×10⁻¹³ exp(−17.9 kJ mole⁻¹/RT) cm³ molecule⁻¹ sec⁻¹ over the temperature range 296–418° K. Br+F₂ is thus another example of the anomalously slow rate which is characteristic of the reactions of F₂ with many atoms.