Effective Charge of Helium Ions in Solids
The effective charge of Helium ions in different materials has been calculated. A charge-state approach to stopping power has been used. In a first step linear theory and interaction with the valence electrons have been taken into account. In order to improve on these results we introduce the interaction with the lattice ion cores and a self-consistent non-linear calculation of the stopping power for the charge state relevant at low velocity. Comparison with experimental data is presented.
KeywordsCharge State Effective Charge Equilibrium Fraction Valence Band State Loss Cross Section
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