Abstract
Radiative Auger emission (RAE) from lithiumlike 20Ca17+ projectiles excited in collisions with He has been measured. The intensity of RAE photons relative to K α x-ray emission is enhanced by a factor of 10 – 17 compared with theoretical calculations for ions with few electron vacancies. The enhancement of RAE for Ca17+ is consistent with the results reported previously for lithiumlike 16S13+ and 23V20+ and indicates a systematic dependence on Z. Both the enhancement and the relative RAE transition rate increase with Z.
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