Calculations of the energy loss of 4He ions in solid elements

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Abstract
We have calculated the energy loss of 4He ions in a number of elemental and rare‐gas solids in the energy range from 0.4 to 4.0 MeV. The calculations are based on the Lindhard‐Winther energy‐loss formalism and use solid‐state charge densities for the target atoms. Stopping cross sections εα are presented as a function of projectile energy and are compared with the Hartreee‐Fock‐Slater isolated‐atom calculations and semiempirical cross sections. It is found that the solid‐state charge densities generally produce a somewhat better energy dependence than the atomic charge densities but that neither produces an adequate fit in the low‐energy region. In particular, solid‐state effects of Ne and Ar lead to a 4–10% increase over the atomic calculations.