Abstract
Cusp-electron emission has been investigated in 25–250 keV/amu He 2+ on Ar collisions. Two processes which contribute to cusp electrons for this collision system, Electron Capture to the Continuum (ECC) and Transfer Ionization (TI), were distinguished by detecting the electrons in coincidence with the charge-state analyzed outgoing He 2+ and He + projectiles, respectively. The ratios of the electron yields for the TI and ECC channels were determined over the energy range investigated. These ratios can provide information on the role of the electron-electron interaction in the two-electron TI process. The measured TI ECC ratios were compared to the measured total double- to single-bound state capture cross-section ratios. These ratios are found to be consistent with a simple relationship based on the independent particle model, indicating a lack of electron-correlation effects for cusp-electron production by TI in these collisions.
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