The rates of the exchange reactions of chlorine atoms with hydrogen chloride and with deuterium chloride were measured as a function of temperature. Chlorine atoms were produced by photodecomposition of chlorine gas and their relative concentration was monitored by their reaction with deuterium: Cl+D2→DCl+D.The temperature dependence of the logarithm of the ratio of rates was found to be nonlinear in the temperature range of 30° to 150°C. Various attempts to calculate the isotope effect assuming different types of tunneling are discussed.
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Klein et al. (1964) studied this question.
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