Abstract
We measured electron yields from the beam entrance and exit surfaces of thin carbon foils ( d ≈ 4–700 μg/cm 2) bombarded with swift ( E p M = 13.6 MeV/u ) highly charged ( q = 16–18) Ar ions. The dependence of the electron yields on target thickness d is analyzed within the framework of a phenomenological semiempirical model. We obtained electron transport lengths of high energy ( E ⪢ 100 eV) δ-electrons and diffusion lengths of slow electrons ( E ⪡ 100 eV). The projectile velocity dependence of these transport lengths is investigated by comparing our present results for 13.6 MeV/u Ar with results obtained with 0.1 MeV/u Ne, 1 MeV/u C, 3.9 MeV/u S and 74 MeV/u Ni. We also discuss the relation between electron yields and the electronic stopping power.
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