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State-selective capture by slow Ar4+, Ar5+ and Ar6+ recoil ions in H, H2 and He

R W McCullough, S M Wilson and H B Gilbody

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Translational energy spectroscopy has been used to study the distribution of excited product ion channels in one-electron capture by Ar4+, Ar5+ and Ar6+ in H, H2 and He at q*1 keV and q*2 keV. Primary ions with the required small energy spread have been obtained from a recoil ion source, but otherwise the apparatus was the same as that developed in the authors previous work. In the absence of detailed theoretical predictions, they have calculated 'reaction windows' based on the dependence of the single-crossing Landau-Zener cross section on the crossing distance. They have also carried out multichannel Landau-Zener calculations to obtain cross sections for capture into specific states. The calculations are shown to be in reasonable accord with the observed energy change spectra.


PACS

34.70.+e Charge transfer

34.50.-s Scattering of atoms and molecules

34.10.+x General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.)

Subjects

Atomic and molecular physics

Dates

Issue 9 (14 May 1987)



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