Heterogeneous Reaction of Hydrogen Iodide with a Chlorine Atom

Previously, using the method of resonance fluorescence on chlorine atoms to measure the reaction rate constant for hydrogen iodide and chlorine atoms, the authors obtained the following expression for the dependence of k1 on the temperature inside the reactor: k1 = (0.9 ± 0. 2) × 10–11e(2.4 ± 0.5 [kJ/mole])/RT molecule–1 cm3 s–1. It followed from the expression that this reaction rate constant decreases as the temperature in the reactor grows. It was supposed that the reaction under study could proceed on the reactor wall. This hypothesis was confirmed by experiments under conditions when the diffusion time of chlorine atoms toward the reactor wall was significantly longer than the reaction time.