Abstract
A recently derived analytic formula for the low-energy dissociative recombination of molecular ions and electrons involving capture into vibrationally excited Rydberg states provides a simple expression for the isotope dependence of the process. This expression depends only on the ratio of the relevant vibrational frequencies of the two isotopomers of interest and can therefore be evaluated even without knowledge of the dynamical parameters required to determine the recombination cross sections. The expression is used to predict the isotope dependence for a number of molecular ions and the results are compared with experiment. While the agreement with the experiment is generally quite reasonable, discrepancies may indicate a breakdown of the assumptions used to derive the cross section formula or potential inaccuracies in the experiments.
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