The energy dependence of the forward and backward rate coefficients for clustering reactions of Li+ ions with Ar, Kr, and Xe

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Abstract
The energy dependence of the clustering reactions of Li+ ions with Ar, Kr, and Xe has been measured in the pressure range 2–4 Torr using a drift tube without mass spectrometer. The energy (center of mass) of the Li+ ions was varied over the range 41–67 meV in Ar, 43–129 meV in Kr, and 48–207 meV in Xe. The energy of the cluster ions was varied over the range 40–44 meV in Ar, 40–48 meV in Kr, and 40–43 meV in Xe. All the gases were maintained at room temperture. It is found that the forward rate coefficients are inversely proportional to the ion energy in all cases. The backward rate coefficients increase rapidly with increasing cluster ion energy. Arrhenius plots of the backward rate coefficients gives the activation energy as 0.34 eV in Ar, 0.45 eV in Kr, and 0.49 eV in Xe.