Abstract
Double differential cross sections in the 20–550 eV energy range and in the full angular range of 0°–180° for electron emission were measured by the impact of 150 keV/u C+ ions on He and Ne atoms. An unexpected, broad structure around 300 eV electron energy has been observed at backward emission angles relative to the beam direction. Our CTMC calculations support the hypothesis that the new structure is due to double scattering of the target electrons on the screened fields of the projectile and the target. According to the present impact-parameter Born calculations, the average degree of ionization is about 50% for C++ Ne collisions, i.e., a multiple ionized system is created in the collision.
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