Determination of the limiting low pressure rate constants of the reactions of CH with N2 and CO: a CRESU measurement at 53 K
Abstract
The pulsed laser photolysis, time-resolved laser-induced fluorescence technique has been implemented in a CRESU (Cine′tiquedeRe′actionenEcoulementSupersoniqueUniforme) apparatus to measure the rates of the association reactions of CH radicals with N2 and CO at 53 K and five different densities of the carrier gas Ar. The pressure-dependent rate constants have been combined with those reported previously for the temperature range 202⩽T/K⩽584 (R. A. Brownsword, L. B. Herbert, I. W. M. Smith and D. W. A. Stewart, J. Chem. Soc., FaradayTrans., 1996, 92, 1087) to yield, via a global fitting procedure, the following expressions for the two rate constants in the limit of low pressure: