Electron capture processes in autoionising-state production in ion—surface scattering

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Results of a study of the formation of doubly excited autoionising states in single and doubly charged inert gas ion collisions with Mg and Al surfaces are presented. In case of Ar ++ ion scattering with a Mg surface, formation of such states is observed as a result of electron capture as the ion approaches the surface. This is not observed in case of Ne ++ scattering on Mg where these excited states result from a violent binary collision with Mg surface atoms. In case of Ne ++ scattering on Al both mechanisms are observed. These results are interpreted in terms of a numerical model which considers a series of Auger and resonant decay and capture processes.