Direct-Reading Apparatus for Determining the Rate Constants of Atomic Reactions

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Abstract
An apparatus is described that measures and directly displays first-order or pseudo-first-order rate constants of atomic reactions. The apparatus is based on measurement of the emission intensity when a trace of a substance that undergoes a chemiluminescent reaction with the atomic species (e.g., reaction of O with NO) is added to the system. The intensity, which is proportional to the concentration of the species, is measured continuously at the entrance and exit of a stirred flow reactor using a chopper and photomultiplier. Electronic circuitry is described which computes the value of the rate constant kpfo from the photomultiplier output and displays it on a meter. The apparatus is particularly suitable for determining rapidly the dependence of kpfo on the concentration of atomic species, other reactants, inert gases, and so forth, that is, the reaction order. Some applications in the study of the reactions of atomic oxygen are described briefly.

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