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• W2890735660 abstract "Many aspects of the interaction of charged particles with matter can be expressed in terms of the dielectric function ε(q,ω). The dielectric function is relatively well known in the optical limit (q=0) but, for example, stopping power calculations require the knowledge of the dielectric function for q≠0. Several approaches have been used to extend the dielectric function to q≠0 for both the valence electrons, using variations of the Lindhard dielectric function and the core levels where an atomic description can be used. The intermediate case of shallow core levels is somewhat problematic. Here collective effects modify the atomic picture, and the hydrogenic approximation of the wave function is less accurate. In this paper we describe a new extension scheme of the contribution to the energy loss function of shallow core levels to q≠0 and show that tor Al and Si it describes the experimental stopping data somewhat better than previous approaches. It also describes reasonably well the proton and electron induced ionization cross section of these shallow core levels. Lastly we investigate the dielectric function in the limit of high momentum, where it can be interpreted as a Compton profile. An approximation scheme in terms of Mermin dielectric function with an amplitude that depends on q works in all cases quite well." @default.
• W2890735660 created "2018-09-27" @default.
• W2890735660 creator A5002839857 @default.
• W2890735660 creator A5010794889 @default.
• W2890735660 date "2019-01-01" @default.
• W2890735660 modified "2023-10-15" @default.
• W2890735660 title "Modelling the contribution of semi-core electrons to the dielectric function" @default.
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• W2890735660 doi "https://doi.org/10.1016/j.jpcs.2018.09.020" @default.
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