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- W2017189069 abstract "We present an extensive study of double electron capture processes in slow collisions of bare ions from C6+ to Al13+ with gases from He to Xe and metallic vapour (strontium, barium, zinc) targets. The Stabilized Double Capture (S.D.C.) process, in which two electrons are captured and stabilized on the projectile, has been studied by measuring the radiative stabilization ratio R2s(R2s = σS.D.C./(σS.D.C. + σA.D.C.); σS.D.C. and σA.D.C. stand for the S.D.C. and Autoionized Double Capture cross sections) and by using optical spectroscopy of Rydberg transitions. We found that the population of asymmetrical configurations (n, n' » n) is responsible for high radiative stabilization ratios. The population of these configurations is due to Auto-transfer into Rydberg state (A.T.R.) and Transfer excitation (T.E.) processes. In the case of F9+ + Ne collision system, the n' distribution of excited Rydberg states has been deduced from a precise analysis of the light emitted by Rydberg transitions. The distribution is compared with a theoretical distribution issued from the A.T.R. model. We also measured the stabilization ratio for higher charge state ions Ar14+, Ar16+, Ar17+, Kr18+, Xe25+, Xe27+ on strontium and rare gas collisions and observed a slight enhancement of R2s values for higher charge states. The observation of high Rydberg transitions for Xe27+ on Xe collision shows that the radiative stabilization process is also explained by a population of asymmetrical configuration issued from A.T.R. and T.E. processes." @default.
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- W2017189069 title "Study of two electron capture in highly charged ion-atom collisions by Rydberg spectroscopy" @default.
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- W2017189069 doi "https://doi.org/10.1088/0031-8949/1997/t73/046" @default.
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