MONTE-CARLO SIMULATION OF YIELD AND ENERGY-DISTRIBUTION OF SECONDARY ELECTRONS EMITTED FROM METAL-SURFACES

A Monte Carlo simulation of secondary electron emission from Be (atomi c number Z=4), Mg (Z=12), Al (Z=13), Mo (Z=42) and W (Z=74) due to 100 eV-4 keV electron impacts is performed in order to understand the pri mary energy (Ep) dependence of the yield and the energy distribution o f secondary electrons. The E(p)-dependence of the secondary electron y ield calculated for the metals is characterized in terms of the maximu m yield and E(p) at which it occurs, which are in good ageement with K ollath's empirical formula for E(p) where the formula can be applied. At high E(p) (>1keV), the calculated energy distribution of the second ary electrons, except for Mg which has a low surface potential barrier , approaches the E(p)-independent theoretical curve derived by Chung a nd Everhart. At low E(p), however, the energy distribution largely dep ends on E(p), in particular for high-Z metal.