Radiative stabilization following transfer of two electrons to Xeq+ (q ≤ 35) in slow collisions with He and Xe
We present a derivation of an ECB-based relation between the branching ratio for autoionization F and the ratio between the cross sections for transfer ionization and single-electron capture. We apply this method to two different experimental results. The method yields semi-empirical upper limits for F of unity for double Rydberg levels formed in Xe q+-He collisions for charge states up to q=29. The fact that direct measurements of σTI/(σTI + σDC) leads to values in the range 0.9<.F<1.0 for the He collisions gives strong support for using the model for the Xe q+-Xe results, where no direct measurements of true double-capture cross sections were made. The latter results show a rather strong decrease of the upper limits for F to values significantly below unity for q>25. We point out that the apparent discrepancy between the results obtained for He and Xe targets at high q could be explained by population of higher angular momentum (l, l′) states in the latter case.
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