Absolute rate constants for the reactions O(³<i>P</i>) atoms with HCl and HBr

Abstract

Abstract A flow tube method has been used to determine rate constants for the elementary reactions: equation image Oxygen atoms were produced by adding a small excess of NO to a stream of partially dissociated nitrogen, and their reaction with hydrogen halide was monitored by observing the intensity of the NO + O afterglow. Experiments were carried out at temperatures from 293 to 440°K with HCl, and from 267 to 430°K with HBr. The role of secondary reactions was minimised and the residual effects were allowed for. The rate constants for the primary reactions could be matched by Arrhenius expressions: where the units are cm 3 /molec·sec and the errors correspond to a standard deviation.