Abstract
The effect of intermittent light, as produced by a rotating sector, has been considered for a chain reaction having the following mechanism: A2+hν→2A,A+B→C+A,2A→stable products,A→stable products.It has been shown how to calculate the reaction rate as a function of the sector speed for different values of a certain parameter which depends on the individual rate constants and the light intensity and gives, essentially, the relative importance of the bimolecular and unimolecular chain-breaking steps. The relationships have been exhibited graphically for the case in which one-fourth of the sector passes the light beam. These relationships may be reversed, making it possible to obtain the rate constants of the intermediate reactions from measurements with intermittent light.
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