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Published November 1, 2005 | public
Journal Article Open

Three-isotope plot of fractionation in photolysis: A perturbation theoretical expression

Abstract

The slope of the three-isotope plot for the isotopomer fractionation by direct or nearly direct photodissociation is obtained using a perturbation theoretical analysis. This result, correct to first order in the mass difference, is the same as that for equilibrium chemical exchange reactions, a similarity unexpected a priori. A comparison is made with computational results for N2O photodissociation. This theoretical slope for mass-dependent photolytic fractionation can be used to analyze the data for isotopic anomalies in spin-allowed photodissociation reactions. Earlier work on chemical equilibria is extended by avoiding a high-temperature approximation.

Additional Information

©2005 American Institute of Physics (Received 20 June 2005; accepted 9 September 2005; published online 31 October 2005) It is a pleasure to acknowledge the support of this research by the National Science Foundation.

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August 22, 2023
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