Absolute rate of the reaction of Cl(2P) with molecular hydrogen from 200–500 K

Abstract

Rate constants for the reaction of atomic chlorine with hydrogen have been measured from 200–500 K using the flash photolysis–resonance fluorescence technique. The rate constants obey the Arrhenius equation k=(2.66 ± 0.42)× 10^–11 exp (–2230 ± 60/T) cm³ molecule^–1 s^–1. The results are compared with previous work and are discussed with particular reference to the equilibrium constant for the reaction and to relative rate data for chlorine atom reactions. Theoretical calculations, using the BEBO method with tunnelling, give excellent agreement with experiment.