Abstract
Absolute doubly differential cross sections for electron emission are presented for 0.5 MeV/u multi‐charged ion impact on helium, neon, and argon targets. For the helium target, Bq+, Cq+ (q=2–5) and Oq+, Fq+ (q=3–6) projectiles were studied; for neaon and argon, only Cq+ (q=2–5) projectiles were used. Electron emission for 10°≤Θ≤60° was studied. The measured cross sections were assumed to scale as the square of an effective projectile charge, Zeff, which was determined as a function of emitted electron energy and angle. For distant collisions (low emitted electron energies), we find that Zeff≊q for small q and Zeff<q for the highest values of q investigated. For sufficiently close collisions (above the binary encounter peak), Zeff≳Z and increases as q decreases. This is true for all angles and targets investigated.
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