Abstract
The multi-electron processes are investigated for 17.9–120 keV/uC1+, 30–323 keV/u C2+, 120–438 keV/u C3+,287–480 keV/u C4+ incident on a helium target. Thecross-section ratios of double electron (DE) process to the total ofthe single electron (SE) and the double electron process (i.e. SE+DE),the direct double electron (DDI) to the direct single ionization (DSI)as well as the contributions of DDI to DE and of TI to DE are measuredusing coincidence techniques. The energy and charge state dependencesof the measured cross-section ratios are studied and discussed.
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