Electron transfer measurements from rare gas targets to O12+ ions between 60 and 200 keV

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Abstract
Charge exchange measurements in thin targets of the rare gases by an O2+ beam have been made between 60 and 200 keV. Taking into account the relative weighting of the final states which are allowed assuming spin, symmetry, and Λ conservation it was found that a crossing theory of the Landau–Zener type is completely inadequate to account for the cross sections of the heavier targets, whereas a non-crossing theory in the Rapp–Francis formulation was found to give good fits, both in energy dependence and overall magnitude, to the cross sections except for the xenon target where it is too small by a factor of 2. The improvement in fit is due to the inclusion of a factor which was omitted in the original formulation of Rapp–Francis, and also the inclusion of many states of the product ions in the calculation.

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