INELASTIC-SCATTERING OF ELECTRONS IN SOLIDS FROM A GENERALIZED OSCILLATOR STRENGTH MODEL USING OPTICAL AND PHOTOELECTRIC DATA

Inelastic scattering of electrons in solids is computed from a general ized oscillator strength model based on optical and photoelectric data . The optical Oscillator strength is extended into the non-zero moment um transfer region by using free-electron gas dispersion for the weakl y bound electrons. The applicability of this method to non-conduction valence electrons and to inner shells is discussed. A different extens ion method, which reproduces ionization thresholds, is used for inner- shell ionization. The calculations are simplified by using a two-modes model for the Lindhard theory of the free-electron gas. Exchange effe cts are accounted for by means of a modified Ochkur approximation. Ine lastic mean free paths and stopping powers obtained from this optical- data model for four materials (Al, Si, Cu and Au) and for electrons wi th energies from 10 eV to 10 keV are presented.