Heterogeneous Chemistry of HBr and HF

Article abstract of DOI:10.1021/j100202a069

The heterogeneous chemistry of HBr and HF was studied on glass and ice surfaces at 200 K.Physical and reactive uptake were investigated using a cylindrical fast-flow reactor in conjunction with a chemical-ionization mass spectrometer.HF exhibited no measurable uptake on ice or NAT nor did it significantly react with ClONO2 or HOCl.It is inferred that HF would be unreactive on polar stratospheric cloud particle surfaces.Physical adsorption or absorption of HBr was observed onto glass, adsorbed H2O layers on glass, and ice.For the relatively high used, a very large uptake by ice was observed, and we detected no saturation of the surface.HBr reacts efficiently with ClONO2, Cl2, and N2O5, especially on ice and nitric acid ice surfaces.BrCl was observed as the primary product for the reaction HBr + ClONO2.The products HCl and Br2 were observed for the reaction of HBr with Cl2.On the basis of these results, it is likely that HBr would be processed efficiently on ice particles.