Abstract
Cusp-electron emission in He2+ on He collisions has beeninvestigated in the energy range 100-300 keV. By detecting theelectrons in coincidence with the charge-state-analysed outgoingHe2+ and He+ ions, the processes of electron capture to thecontinuum (ECC), and ECC accompanied by bound-state capture (transferionization, TI) were identified, respectively. The ratios of yieldsfor the TI and ECC cusps are found to increase steeply withdecreasing projectile energy. At 100 keV the obtained TI/ECC ratio(1.42±0.14) is almost two times larger than the correspondingratio measured in a previous experiment for an Ar target at the sameimpact energy. The measured data are compared with calculationscarried out in the independent particle model with use of theclassical trajectory Monte Carlo method and thecontinuum-distorted-wave theory. The disagreement observed betweenthe theory and experiment indicates the presence of electroncorrelation effects in TI.
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