Low energy study of symmetric and asymmetric charge-transfer reactions

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Abstract
A modified Varian ion cyclotron resonance (ICR) mass spectrometer was used to measure absolute rate constants for charge transfer from Kr+ to Kr and CO as well as from CO+ to Kr and CO. The technique of double resonance permitted measurement of the rate constants over the translational energy range from 0.1 to 10 eV. Ion motion in an ICR mass spectrometer was analyzed to give an average ion velocity which was used to convert the reaction rate constants to cross sections. These results are compared to the theoretical results of Rapp and Francis, with Langevin and with existing experimental results. One of the most striking results is that at a very low energy the cross sections for the crossed or asymmetric reactions are substantially greater than the cross sections for the symmetric charge‐transfer reactions.

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